diff --git a/package.json b/package.json
index c2343c1..044bf74 100644
--- a/package.json
+++ b/package.json
@@ -68,7 +68,7 @@
     "babel-preset-env": "^1.6.1",
     "js-devbox": "^5.0.0",
     "mocha": "^4.0.1",
-    "nyc": "^11.4.1",
+    "nyc": "^13.0.1",
     "proxyquire": "^1.7.11",
     "sinon": "^4.1.3"
   },
diff --git a/yarn.lock b/yarn.lock
index 535a64c..8737531 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -10,6 +10,12 @@
     esutils "^2.0.2"
     js-tokens "^3.0.0"
 
+"@babel/code-frame@7.0.0-beta.51":
+  version "7.0.0-beta.51"
+  resolved "https://registry.yarnpkg.com/@babel/code-frame/-/code-frame-7.0.0-beta.51.tgz#bd71d9b192af978df915829d39d4094456439a0c"
+  dependencies:
+    "@babel/highlight" "7.0.0-beta.51"
+
 "@babel/code-frame@^7.0.0-beta.35":
   version "7.0.0-beta.35"
   resolved "https://registry.yarnpkg.com/@babel/code-frame/-/code-frame-7.0.0-beta.35.tgz#04eeb6dca7efef8f65776a4c214157303b85ad51"
@@ -18,6 +24,16 @@
     esutils "^2.0.2"
     js-tokens "^3.0.0"
 
+"@babel/generator@7.0.0-beta.51":
+  version "7.0.0-beta.51"
+  resolved "https://registry.yarnpkg.com/@babel/generator/-/generator-7.0.0-beta.51.tgz#6c7575ffde761d07485e04baedc0392c6d9e30f6"
+  dependencies:
+    "@babel/types" "7.0.0-beta.51"
+    jsesc "^2.5.1"
+    lodash "^4.17.5"
+    source-map "^0.5.0"
+    trim-right "^1.0.1"
+
 "@babel/helper-function-name@7.0.0-beta.31":
   version "7.0.0-beta.31"
   resolved "https://registry.yarnpkg.com/@babel/helper-function-name/-/helper-function-name-7.0.0-beta.31.tgz#afe63ad799209989348b1109b44feb66aa245f57"
@@ -27,12 +43,44 @@
     "@babel/traverse" "7.0.0-beta.31"
     "@babel/types" "7.0.0-beta.31"
 
+"@babel/helper-function-name@7.0.0-beta.51":
+  version "7.0.0-beta.51"
+  resolved "https://registry.yarnpkg.com/@babel/helper-function-name/-/helper-function-name-7.0.0-beta.51.tgz#21b4874a227cf99ecafcc30a90302da5a2640561"
+  dependencies:
+    "@babel/helper-get-function-arity" "7.0.0-beta.51"
+    "@babel/template" "7.0.0-beta.51"
+    "@babel/types" "7.0.0-beta.51"
+
 "@babel/helper-get-function-arity@7.0.0-beta.31":
   version "7.0.0-beta.31"
   resolved "https://registry.yarnpkg.com/@babel/helper-get-function-arity/-/helper-get-function-arity-7.0.0-beta.31.tgz#1176d79252741218e0aec872ada07efb2b37a493"
   dependencies:
     "@babel/types" "7.0.0-beta.31"
 
+"@babel/helper-get-function-arity@7.0.0-beta.51":
+  version "7.0.0-beta.51"
+  resolved "https://registry.yarnpkg.com/@babel/helper-get-function-arity/-/helper-get-function-arity-7.0.0-beta.51.tgz#3281b2d045af95c172ce91b20825d85ea4676411"
+  dependencies:
+    "@babel/types" "7.0.0-beta.51"
+
+"@babel/helper-split-export-declaration@7.0.0-beta.51":
+  version "7.0.0-beta.51"
+  resolved "https://registry.yarnpkg.com/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.0.0-beta.51.tgz#8a6c3f66c4d265352fc077484f9f6e80a51ab978"
+  dependencies:
+    "@babel/types" "7.0.0-beta.51"
+
+"@babel/highlight@7.0.0-beta.51":
+  version "7.0.0-beta.51"
+  resolved "https://registry.yarnpkg.com/@babel/highlight/-/highlight-7.0.0-beta.51.tgz#e8844ae25a1595ccfd42b89623b4376ca06d225d"
+  dependencies:
+    chalk "^2.0.0"
+    esutils "^2.0.2"
+    js-tokens "^3.0.0"
+
+"@babel/parser@7.0.0-beta.51":
+  version "7.0.0-beta.51"
+  resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.0.0-beta.51.tgz#27cec2df409df60af58270ed8f6aa55409ea86f6"
+
 "@babel/template@7.0.0-beta.31":
   version "7.0.0-beta.31"
   resolved "https://registry.yarnpkg.com/@babel/template/-/template-7.0.0-beta.31.tgz#577bb29389f6c497c3e7d014617e7d6713f68bda"
@@ -42,6 +90,15 @@
     babylon "7.0.0-beta.31"
     lodash "^4.2.0"
 
+"@babel/template@7.0.0-beta.51":
+  version "7.0.0-beta.51"
+  resolved "https://registry.yarnpkg.com/@babel/template/-/template-7.0.0-beta.51.tgz#9602a40aebcf357ae9677e2532ef5fc810f5fbff"
+  dependencies:
+    "@babel/code-frame" "7.0.0-beta.51"
+    "@babel/parser" "7.0.0-beta.51"
+    "@babel/types" "7.0.0-beta.51"
+    lodash "^4.17.5"
+
 "@babel/traverse@7.0.0-beta.31":
   version "7.0.0-beta.31"
   resolved "https://registry.yarnpkg.com/@babel/traverse/-/traverse-7.0.0-beta.31.tgz#db399499ad74aefda014f0c10321ab255134b1df"
@@ -55,6 +112,21 @@
     invariant "^2.2.0"
     lodash "^4.2.0"
 
+"@babel/traverse@7.0.0-beta.51":
+  version "7.0.0-beta.51"
+  resolved "https://registry.yarnpkg.com/@babel/traverse/-/traverse-7.0.0-beta.51.tgz#981daf2cec347a6231d3aa1d9e1803b03aaaa4a8"
+  dependencies:
+    "@babel/code-frame" "7.0.0-beta.51"
+    "@babel/generator" "7.0.0-beta.51"
+    "@babel/helper-function-name" "7.0.0-beta.51"
+    "@babel/helper-split-export-declaration" "7.0.0-beta.51"
+    "@babel/parser" "7.0.0-beta.51"
+    "@babel/types" "7.0.0-beta.51"
+    debug "^3.1.0"
+    globals "^11.1.0"
+    invariant "^2.2.0"
+    lodash "^4.17.5"
+
 "@babel/types@7.0.0-beta.31":
   version "7.0.0-beta.31"
   resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.0.0-beta.31.tgz#42c9c86784f674c173fb21882ca9643334029de4"
@@ -63,6 +135,14 @@
     lodash "^4.2.0"
     to-fast-properties "^2.0.0"
 
+"@babel/types@7.0.0-beta.51":
+  version "7.0.0-beta.51"
+  resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.0.0-beta.51.tgz#d802b7b543b5836c778aa691797abf00f3d97ea9"
+  dependencies:
+    esutils "^2.0.2"
+    lodash "^4.17.5"
+    to-fast-properties "^2.0.0"
+
 "@sindresorhus/is@^0.6.0":
   version "0.6.0"
   resolved "https://registry.yarnpkg.com/@sindresorhus/is/-/is-0.6.0.tgz#383f456b26bc96c7889f0332079f4358b16c58dc"
@@ -178,6 +258,12 @@ append-transform@^0.4.0:
   dependencies:
     default-require-extensions "^1.0.0"
 
+append-transform@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/append-transform/-/append-transform-1.0.0.tgz#046a52ae582a228bd72f58acfbe2967c678759ab"
+  dependencies:
+    default-require-extensions "^2.0.0"
+
 aproba@^1.0.3:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/aproba/-/aproba-1.2.0.tgz#6802e6264efd18c790a1b0d517f0f2627bf2c94a"
@@ -928,13 +1014,14 @@ cacheable-request@^2.1.1:
     normalize-url "2.0.0"
     responselike "1.0.2"
 
-caching-transform@^1.0.0:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/caching-transform/-/caching-transform-1.0.1.tgz#6dbdb2f20f8d8fbce79f3e94e9d1742dcdf5c0a1"
+caching-transform@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/caching-transform/-/caching-transform-2.0.0.tgz#e1292bd92d35b6e8b1ed7075726724b3bd64eea0"
   dependencies:
-    md5-hex "^1.2.0"
-    mkdirp "^0.5.1"
-    write-file-atomic "^1.1.4"
+    make-dir "^1.0.0"
+    md5-hex "^2.0.0"
+    package-hash "^2.0.0"
+    write-file-atomic "^2.0.0"
 
 caller-path@^0.1.0:
   version "0.1.0"
@@ -1061,6 +1148,14 @@ cliui@^3.2.0:
     strip-ansi "^3.0.1"
     wrap-ansi "^2.0.0"
 
+cliui@^4.0.0:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/cliui/-/cliui-4.1.0.tgz#348422dbe82d800b3022eef4f6ac10bf2e4d1b49"
+  dependencies:
+    string-width "^2.1.1"
+    strip-ansi "^4.0.0"
+    wrap-ansi "^2.0.0"
+
 clone-response@1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/clone-response/-/clone-response-1.0.2.tgz#d1dc973920314df67fbeb94223b4ee350239e96b"
@@ -1133,7 +1228,7 @@ content-type-parser@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/content-type-parser/-/content-type-parser-1.0.2.tgz#caabe80623e63638b2502fd4c7f12ff4ce2352e7"
 
-convert-source-map@^1.3.0, convert-source-map@^1.4.0, convert-source-map@^1.5.0:
+convert-source-map@^1.4.0, convert-source-map@^1.5.0, convert-source-map@^1.5.1:
   version "1.5.1"
   resolved "https://registry.yarnpkg.com/convert-source-map/-/convert-source-map-1.5.1.tgz#b8278097b9bc229365de5c62cf5fcaed8b5599e5"
 
@@ -1249,6 +1344,12 @@ default-require-extensions@^1.0.0:
   dependencies:
     strip-bom "^2.0.0"
 
+default-require-extensions@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/default-require-extensions/-/default-require-extensions-2.0.0.tgz#f5f8fbb18a7d6d50b21f641f649ebb522cfe24f7"
+  dependencies:
+    strip-bom "^3.0.0"
+
 define-properties@^1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/define-properties/-/define-properties-1.1.2.tgz#83a73f2fea569898fb737193c8f873caf6d45c94"
@@ -1357,6 +1458,10 @@ es-to-primitive@^1.1.1:
     is-date-object "^1.0.1"
     is-symbol "^1.0.1"
 
+es6-error@^4.0.1:
+  version "4.1.1"
+  resolved "https://registry.yarnpkg.com/es6-error/-/es6-error-4.1.1.tgz#9e3af407459deed47e9a91f9b885a84eb05c561d"
+
 escape-string-regexp@1.0.5, escape-string-regexp@^1.0.2, escape-string-regexp@^1.0.5:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz#1b61c0562190a8dff6ae3bb2cf0200ca130b86d4"
@@ -1672,13 +1777,13 @@ fill-range@^2.1.0:
     repeat-element "^1.1.2"
     repeat-string "^1.5.2"
 
-find-cache-dir@^0.1.1:
-  version "0.1.1"
-  resolved "https://registry.yarnpkg.com/find-cache-dir/-/find-cache-dir-0.1.1.tgz#c8defae57c8a52a8a784f9e31c57c742e993a0b9"
+find-cache-dir@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/find-cache-dir/-/find-cache-dir-2.0.0.tgz#4c1faed59f45184530fb9d7fa123a4d04a98472d"
   dependencies:
     commondir "^1.0.1"
-    mkdirp "^0.5.1"
-    pkg-dir "^1.0.0"
+    make-dir "^1.0.0"
+    pkg-dir "^3.0.0"
 
 find-parent-dir@^0.3.0:
   version "0.3.0"
@@ -1697,6 +1802,12 @@ find-up@^2.0.0, find-up@^2.1.0:
   dependencies:
     locate-path "^2.0.0"
 
+find-up@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/find-up/-/find-up-3.0.0.tgz#49169f1d7993430646da61ecc5ae355c21c97b73"
+  dependencies:
+    locate-path "^3.0.0"
+
 flat-cache@^1.2.1:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/flat-cache/-/flat-cache-1.3.0.tgz#d3030b32b38154f4e3b7e9c709f490f7ef97c481"
@@ -1724,7 +1835,7 @@ foreach@^2.0.5:
   version "2.0.5"
   resolved "https://registry.yarnpkg.com/foreach/-/foreach-2.0.5.tgz#0bee005018aeb260d0a3af3ae658dd0136ec1b99"
 
-foreground-child@^1.5.3, foreground-child@^1.5.6:
+foreground-child@^1.5.6:
   version "1.5.6"
   resolved "https://registry.yarnpkg.com/foreground-child/-/foreground-child-1.5.6.tgz#4fd71ad2dfde96789b980a5c0a295937cb2f5ce9"
   dependencies:
@@ -1860,7 +1971,7 @@ glob-parent@^2.0.0:
   dependencies:
     is-glob "^2.0.0"
 
-glob@7.1.2, glob@^7.0.3, glob@^7.0.5, glob@^7.0.6, glob@^7.1.1, glob@^7.1.2:
+glob@7.1.2, glob@^7.0.3, glob@^7.0.5, glob@^7.1.1, glob@^7.1.2:
   version "7.1.2"
   resolved "https://registry.yarnpkg.com/glob/-/glob-7.1.2.tgz#c19c9df9a028702d678612384a6552404c636d15"
   dependencies:
@@ -1879,6 +1990,10 @@ globals@^11.0.1:
   version "11.1.0"
   resolved "https://registry.yarnpkg.com/globals/-/globals-11.1.0.tgz#632644457f5f0e3ae711807183700ebf2e4633e4"
 
+globals@^11.1.0:
+  version "11.7.0"
+  resolved "https://registry.yarnpkg.com/globals/-/globals-11.7.0.tgz#a583faa43055b1aca771914bf68258e2fc125673"
+
 globals@^9.18.0:
   version "9.18.0"
   resolved "https://registry.yarnpkg.com/globals/-/globals-9.18.0.tgz#aa3896b3e69b487f17e31ed2143d69a8e30c2d8a"
@@ -1932,7 +2047,7 @@ growly@^1.3.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/growly/-/growly-1.3.0.tgz#f10748cbe76af964b7c96c93c6bcc28af120c081"
 
-handlebars@^4.0.3:
+handlebars@^4.0.11, handlebars@^4.0.3:
   version "4.0.11"
   resolved "https://registry.yarnpkg.com/handlebars/-/handlebars-4.0.11.tgz#630a35dfe0294bc281edae6ffc5d329fc7982dcc"
   dependencies:
@@ -1978,6 +2093,10 @@ has-flag@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/has-flag/-/has-flag-2.0.0.tgz#e8207af1cc7b30d446cc70b734b5e8be18f88d51"
 
+has-flag@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/has-flag/-/has-flag-3.0.0.tgz#b5d454dc2199ae225699f3467e5a07f3b955bafd"
+
 has-symbol-support-x@^1.4.1:
   version "1.4.1"
   resolved "https://registry.yarnpkg.com/has-symbol-support-x/-/has-symbol-support-x-1.4.1.tgz#66ec2e377e0c7d7ccedb07a3a84d77510ff1bc4c"
@@ -2368,12 +2487,22 @@ istanbul-lib-coverage@^1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/istanbul-lib-coverage/-/istanbul-lib-coverage-1.1.1.tgz#73bfb998885299415c93d38a3e9adf784a77a9da"
 
+istanbul-lib-coverage@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.1.tgz#2aee0e073ad8c5f6a0b00e0dfbf52b4667472eda"
+
 istanbul-lib-hook@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/istanbul-lib-hook/-/istanbul-lib-hook-1.1.0.tgz#8538d970372cb3716d53e55523dd54b557a8d89b"
   dependencies:
     append-transform "^0.4.0"
 
+istanbul-lib-hook@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/istanbul-lib-hook/-/istanbul-lib-hook-2.0.1.tgz#918a57b75a0f951d552a08487ca1fa5336433d72"
+  dependencies:
+    append-transform "^1.0.0"
+
 istanbul-lib-instrument@^1.7.5, istanbul-lib-instrument@^1.8.0, istanbul-lib-instrument@^1.9.1:
   version "1.9.1"
   resolved "https://registry.yarnpkg.com/istanbul-lib-instrument/-/istanbul-lib-instrument-1.9.1.tgz#250b30b3531e5d3251299fdd64b0b2c9db6b558e"
@@ -2386,6 +2515,18 @@ istanbul-lib-instrument@^1.7.5, istanbul-lib-instrument@^1.8.0, istanbul-lib-ins
     istanbul-lib-coverage "^1.1.1"
     semver "^5.3.0"
 
+istanbul-lib-instrument@^2.3.2:
+  version "2.3.2"
+  resolved "https://registry.yarnpkg.com/istanbul-lib-instrument/-/istanbul-lib-instrument-2.3.2.tgz#b287cbae2b5f65f3567b05e2e29b275eaf92d25e"
+  dependencies:
+    "@babel/generator" "7.0.0-beta.51"
+    "@babel/parser" "7.0.0-beta.51"
+    "@babel/template" "7.0.0-beta.51"
+    "@babel/traverse" "7.0.0-beta.51"
+    "@babel/types" "7.0.0-beta.51"
+    istanbul-lib-coverage "^2.0.1"
+    semver "^5.5.0"
+
 istanbul-lib-report@^1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/istanbul-lib-report/-/istanbul-lib-report-1.1.2.tgz#922be27c13b9511b979bd1587359f69798c1d425"
@@ -2395,6 +2536,14 @@ istanbul-lib-report@^1.1.2:
     path-parse "^1.0.5"
     supports-color "^3.1.2"
 
+istanbul-lib-report@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/istanbul-lib-report/-/istanbul-lib-report-2.0.1.tgz#64a0a08f42676b9c801b841b9dc3311017c6ae09"
+  dependencies:
+    istanbul-lib-coverage "^2.0.1"
+    make-dir "^1.3.0"
+    supports-color "^5.4.0"
+
 istanbul-lib-source-maps@^1.2.1, istanbul-lib-source-maps@^1.2.2:
   version "1.2.2"
   resolved "https://registry.yarnpkg.com/istanbul-lib-source-maps/-/istanbul-lib-source-maps-1.2.2.tgz#750578602435f28a0c04ee6d7d9e0f2960e62c1c"
@@ -2405,12 +2554,28 @@ istanbul-lib-source-maps@^1.2.1, istanbul-lib-source-maps@^1.2.2:
     rimraf "^2.6.1"
     source-map "^0.5.3"
 
+istanbul-lib-source-maps@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/istanbul-lib-source-maps/-/istanbul-lib-source-maps-2.0.1.tgz#ce8b45131d8293fdeaa732f4faf1852d13d0a97e"
+  dependencies:
+    debug "^3.1.0"
+    istanbul-lib-coverage "^2.0.1"
+    make-dir "^1.3.0"
+    rimraf "^2.6.2"
+    source-map "^0.6.1"
+
 istanbul-reports@^1.1.3:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/istanbul-reports/-/istanbul-reports-1.1.3.tgz#3b9e1e8defb6d18b1d425da8e8b32c5a163f2d10"
   dependencies:
     handlebars "^4.0.3"
 
+istanbul-reports@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/istanbul-reports/-/istanbul-reports-2.0.0.tgz#eb12eddf55724ebc557b32cd77c34d11ed7980c1"
+  dependencies:
+    handlebars "^4.0.11"
+
 isurl@^1.0.0-alpha5:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/isurl/-/isurl-1.0.0.tgz#b27f4f49f3cdaa3ea44a0a5b7f3462e6edc39d67"
@@ -2747,6 +2912,10 @@ jsesc@^1.3.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/jsesc/-/jsesc-1.3.0.tgz#46c3fec8c1892b12b0833db9bc7622176dbab34b"
 
+jsesc@^2.5.1:
+  version "2.5.1"
+  resolved "https://registry.yarnpkg.com/jsesc/-/jsesc-2.5.1.tgz#e421a2a8e20d6b0819df28908f782526b96dd1fe"
+
 jsesc@~0.5.0:
   version "0.5.0"
   resolved "https://registry.yarnpkg.com/jsesc/-/jsesc-0.5.0.tgz#e7dee66e35d6fc16f710fe91d5cf69f70f08911d"
@@ -2755,6 +2924,10 @@ json-buffer@3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/json-buffer/-/json-buffer-3.0.0.tgz#5b1f397afc75d677bde8bcfc0e47e1f9a3d9a898"
 
+json-parse-better-errors@^1.0.1:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/json-parse-better-errors/-/json-parse-better-errors-1.0.2.tgz#bb867cfb3450e69107c131d1c514bab3dc8bcaa9"
+
 json-schema-traverse@^0.3.0:
   version "0.3.1"
   resolved "https://registry.yarnpkg.com/json-schema-traverse/-/json-schema-traverse-0.3.1.tgz#349a6d44c53a51de89b40805c5d5e59b417d3340"
@@ -2933,6 +3106,15 @@ load-json-file@^2.0.0:
     pify "^2.0.0"
     strip-bom "^3.0.0"
 
+load-json-file@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/load-json-file/-/load-json-file-4.0.0.tgz#2f5f45ab91e33216234fd53adab668eb4ec0993b"
+  dependencies:
+    graceful-fs "^4.1.2"
+    parse-json "^4.0.0"
+    pify "^3.0.0"
+    strip-bom "^3.0.0"
+
 locate-path@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/locate-path/-/locate-path-2.0.0.tgz#2b568b265eec944c6d9c0de9c3dbbbca0354cd8e"
@@ -2940,10 +3122,21 @@ locate-path@^2.0.0:
     p-locate "^2.0.0"
     path-exists "^3.0.0"
 
+locate-path@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/locate-path/-/locate-path-3.0.0.tgz#dbec3b3ab759758071b58fe59fc41871af21400e"
+  dependencies:
+    p-locate "^3.0.0"
+    path-exists "^3.0.0"
+
 lodash.cond@^4.3.0:
   version "4.5.2"
   resolved "https://registry.yarnpkg.com/lodash.cond/-/lodash.cond-4.5.2.tgz#f471a1da486be60f6ab955d17115523dd1d255d5"
 
+lodash.flattendeep@^4.4.0:
+  version "4.4.0"
+  resolved "https://registry.yarnpkg.com/lodash.flattendeep/-/lodash.flattendeep-4.4.0.tgz#fb030917f86a3134e5bc9bec0d69e0013ddfedb2"
+
 lodash.get@^4.4.2:
   version "4.4.2"
   resolved "https://registry.yarnpkg.com/lodash.get/-/lodash.get-4.4.2.tgz#2d177f652fa31e939b4438d5341499dfa3825e99"
@@ -2956,6 +3149,10 @@ lodash@^4.13.1, lodash@^4.14.0, lodash@^4.15.0, lodash@^4.17.4, lodash@^4.2.0, l
   version "4.17.4"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.4.tgz#78203a4d1c328ae1d86dca6460e369b57f4055ae"
 
+lodash@^4.17.5:
+  version "4.17.10"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.10.tgz#1b7793cf7259ea38fb3661d4d38b3260af8ae4e7"
+
 lodash@~3.9.3:
   version "3.9.3"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-3.9.3.tgz#0159e86832feffc6d61d852b12a953b99496bd32"
@@ -3008,15 +3205,21 @@ lru-cache@^4.0.1:
     pseudomap "^1.0.2"
     yallist "^2.1.2"
 
+make-dir@^1.0.0, make-dir@^1.3.0:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/make-dir/-/make-dir-1.3.0.tgz#79c1033b80515bd6d24ec9933e860ca75ee27f0c"
+  dependencies:
+    pify "^3.0.0"
+
 makeerror@1.0.x:
   version "1.0.11"
   resolved "https://registry.yarnpkg.com/makeerror/-/makeerror-1.0.11.tgz#e01a5c9109f2af79660e4e8b9587790184f5a96c"
   dependencies:
     tmpl "1.0.x"
 
-md5-hex@^1.2.0:
-  version "1.3.0"
-  resolved "https://registry.yarnpkg.com/md5-hex/-/md5-hex-1.3.0.tgz#d2c4afe983c4370662179b8cad145219135046c4"
+md5-hex@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/md5-hex/-/md5-hex-2.0.0.tgz#d0588e9f1c74954492ecd24ac0ac6ce997d92e33"
   dependencies:
     md5-o-matic "^0.1.1"
 
@@ -3034,11 +3237,11 @@ merge-descriptors@~1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/merge-descriptors/-/merge-descriptors-1.0.1.tgz#b00aaa556dd8b44568150ec9d1b953f3f90cbb61"
 
-merge-source-map@^1.0.2:
-  version "1.0.4"
-  resolved "https://registry.yarnpkg.com/merge-source-map/-/merge-source-map-1.0.4.tgz#a5de46538dae84d4114cc5ea02b4772a6346701f"
+merge-source-map@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/merge-source-map/-/merge-source-map-1.1.0.tgz#2fdde7e6020939f70906a68f2d7ae685e4c8c646"
   dependencies:
-    source-map "^0.5.6"
+    source-map "^0.6.1"
 
 merge-stream@^1.0.1:
   version "1.0.1"
@@ -3255,37 +3458,35 @@ nwmatcher@^1.4.3:
   version "1.4.3"
   resolved "https://registry.yarnpkg.com/nwmatcher/-/nwmatcher-1.4.3.tgz#64348e3b3d80f035b40ac11563d278f8b72db89c"
 
-nyc@^11.4.1:
-  version "11.4.1"
-  resolved "https://registry.yarnpkg.com/nyc/-/nyc-11.4.1.tgz#13fdf7e7ef22d027c61d174758f6978a68f4f5e5"
+nyc@^13.0.1:
+  version "13.0.1"
+  resolved "https://registry.yarnpkg.com/nyc/-/nyc-13.0.1.tgz#b61857ed633c803353fc41eeca775d0e1f62034b"
   dependencies:
     archy "^1.0.0"
     arrify "^1.0.1"
-    caching-transform "^1.0.0"
-    convert-source-map "^1.3.0"
+    caching-transform "^2.0.0"
+    convert-source-map "^1.5.1"
     debug-log "^1.0.1"
-    default-require-extensions "^1.0.0"
-    find-cache-dir "^0.1.1"
-    find-up "^2.1.0"
-    foreground-child "^1.5.3"
-    glob "^7.0.6"
-    istanbul-lib-coverage "^1.1.1"
-    istanbul-lib-hook "^1.1.0"
-    istanbul-lib-instrument "^1.9.1"
-    istanbul-lib-report "^1.1.2"
-    istanbul-lib-source-maps "^1.2.2"
-    istanbul-reports "^1.1.3"
-    md5-hex "^1.2.0"
-    merge-source-map "^1.0.2"
-    micromatch "^2.3.11"
-    mkdirp "^0.5.0"
-    resolve-from "^2.0.0"
-    rimraf "^2.5.4"
-    signal-exit "^3.0.1"
+    find-cache-dir "^2.0.0"
+    find-up "^3.0.0"
+    foreground-child "^1.5.6"
+    glob "^7.1.2"
+    istanbul-lib-coverage "^2.0.1"
+    istanbul-lib-hook "^2.0.1"
+    istanbul-lib-instrument "^2.3.2"
+    istanbul-lib-report "^2.0.1"
+    istanbul-lib-source-maps "^2.0.1"
+    istanbul-reports "^2.0.0"
+    make-dir "^1.3.0"
+    merge-source-map "^1.1.0"
+    resolve-from "^4.0.0"
+    rimraf "^2.6.2"
+    signal-exit "^3.0.2"
     spawn-wrap "^1.4.2"
-    test-exclude "^4.1.1"
-    yargs "^10.0.3"
-    yargs-parser "^8.0.0"
+    test-exclude "^5.0.0"
+    uuid "^3.3.2"
+    yargs "11.1.0"
+    yargs-parser "^9.0.2"
 
 oauth-sign@~0.8.1, oauth-sign@~0.8.2:
   version "0.8.2"
@@ -3403,12 +3604,24 @@ p-limit@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/p-limit/-/p-limit-1.1.0.tgz#b07ff2d9a5d88bec806035895a2bab66a27988bc"
 
+p-limit@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/p-limit/-/p-limit-2.0.0.tgz#e624ed54ee8c460a778b3c9f3670496ff8a57aec"
+  dependencies:
+    p-try "^2.0.0"
+
 p-locate@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/p-locate/-/p-locate-2.0.0.tgz#20a0103b222a70c8fd39cc2e580680f3dde5ec43"
   dependencies:
     p-limit "^1.1.0"
 
+p-locate@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/p-locate/-/p-locate-3.0.0.tgz#322d69a05c0264b25997d9f40cd8a891ab0064a4"
+  dependencies:
+    p-limit "^2.0.0"
+
 p-map@^1.1.1:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/p-map/-/p-map-1.2.0.tgz#e4e94f311eabbc8633a1e79908165fca26241b6b"
@@ -3419,6 +3632,19 @@ p-timeout@^2.0.1:
   dependencies:
     p-finally "^1.0.0"
 
+p-try@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/p-try/-/p-try-2.0.0.tgz#85080bb87c64688fa47996fe8f7dfbe8211760b1"
+
+package-hash@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/package-hash/-/package-hash-2.0.0.tgz#78ae326c89e05a4d813b68601977af05c00d2a0d"
+  dependencies:
+    graceful-fs "^4.1.11"
+    lodash.flattendeep "^4.4.0"
+    md5-hex "^2.0.0"
+    release-zalgo "^1.0.0"
+
 parse-glob@^3.0.4:
   version "3.0.4"
   resolved "https://registry.yarnpkg.com/parse-glob/-/parse-glob-3.0.4.tgz#b2c376cfb11f35513badd173ef0bb6e3a388391c"
@@ -3440,6 +3666,13 @@ parse-json@^3.0.0:
   dependencies:
     error-ex "^1.3.1"
 
+parse-json@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/parse-json/-/parse-json-4.0.0.tgz#be35f5425be1f7f6c747184f98a788cb99477ee0"
+  dependencies:
+    error-ex "^1.3.1"
+    json-parse-better-errors "^1.0.1"
+
 parse5@^3.0.2:
   version "3.0.3"
   resolved "https://registry.yarnpkg.com/parse5/-/parse5-3.0.3.tgz#042f792ffdd36851551cf4e9e066b3874ab45b5c"
@@ -3492,6 +3725,12 @@ path-type@^2.0.0:
   dependencies:
     pify "^2.0.0"
 
+path-type@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/path-type/-/path-type-3.0.0.tgz#cef31dc8e0a1a3bb0d105c0cd97cf3bf47f4e36f"
+  dependencies:
+    pify "^3.0.0"
+
 performance-now@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/performance-now/-/performance-now-0.2.0.tgz#33ef30c5c77d4ea21c5a53869d91b56d8f2555e5"
@@ -3524,6 +3763,12 @@ pkg-dir@^1.0.0:
   dependencies:
     find-up "^1.0.0"
 
+pkg-dir@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/pkg-dir/-/pkg-dir-3.0.0.tgz#2749020f239ed990881b1f71210d51eb6523bea3"
+  dependencies:
+    find-up "^3.0.0"
+
 pluralize@^7.0.0:
   version "7.0.0"
   resolved "https://registry.yarnpkg.com/pluralize/-/pluralize-7.0.0.tgz#298b89df8b93b0221dbf421ad2b1b1ea23fc6777"
@@ -3652,6 +3897,13 @@ read-pkg-up@^2.0.0:
     find-up "^2.0.0"
     read-pkg "^2.0.0"
 
+read-pkg-up@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/read-pkg-up/-/read-pkg-up-4.0.0.tgz#1b221c6088ba7799601c808f91161c66e58f8978"
+  dependencies:
+    find-up "^3.0.0"
+    read-pkg "^3.0.0"
+
 read-pkg@^1.0.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/read-pkg/-/read-pkg-1.1.0.tgz#f5ffaa5ecd29cb31c0474bca7d756b6bb29e3f28"
@@ -3668,6 +3920,14 @@ read-pkg@^2.0.0:
     normalize-package-data "^2.3.2"
     path-type "^2.0.0"
 
+read-pkg@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/read-pkg/-/read-pkg-3.0.0.tgz#9cbc686978fee65d16c00e2b19c237fcf6e38389"
+  dependencies:
+    load-json-file "^4.0.0"
+    normalize-package-data "^2.3.2"
+    path-type "^3.0.0"
+
 readable-stream@^2.0.0, readable-stream@^2.0.1, readable-stream@^2.0.2, readable-stream@^2.0.6, readable-stream@^2.1.4, readable-stream@^2.2.2:
   version "2.3.3"
   resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.3.3.tgz#368f2512d79f9d46fdfc71349ae7878bbc1eb95c"
@@ -3739,6 +3999,12 @@ regjsparser@^0.1.4:
   dependencies:
     jsesc "~0.5.0"
 
+release-zalgo@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/release-zalgo/-/release-zalgo-1.0.0.tgz#09700b7e5074329739330e535c5a90fb67851730"
+  dependencies:
+    es6-error "^4.0.1"
+
 remove-trailing-separator@^1.0.1:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/remove-trailing-separator/-/remove-trailing-separator-1.1.0.tgz#c24bce2a283adad5bc3f58e0d48249b92379d8ef"
@@ -3848,9 +4114,9 @@ resolve-from@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/resolve-from/-/resolve-from-1.0.1.tgz#26cbfe935d1aeeeabb29bc3fe5aeb01e93d44226"
 
-resolve-from@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/resolve-from/-/resolve-from-2.0.0.tgz#9480ab20e94ffa1d9e80a804c7ea147611966b57"
+resolve-from@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/resolve-from/-/resolve-from-4.0.0.tgz#4abcd852ad32dd7baabfe9b40e00a36db5f392e6"
 
 resolve@1.1.7, resolve@~1.1.7:
   version "1.1.7"
@@ -3946,6 +4212,10 @@ sax@^1.2.1:
   version "5.4.1"
   resolved "https://registry.yarnpkg.com/semver/-/semver-5.4.1.tgz#e059c09d8571f0540823733433505d3a2f00b18e"
 
+semver@^5.5.0:
+  version "5.5.1"
+  resolved "https://registry.yarnpkg.com/semver/-/semver-5.5.1.tgz#7dfdd8814bdb7cabc7be0fb1d734cfb66c940477"
+
 set-blocking@^2.0.0, set-blocking@~2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/set-blocking/-/set-blocking-2.0.0.tgz#045f9782d011ae9a6803ddd382b24392b3d890f7"
@@ -3968,7 +4238,7 @@ shellwords@^0.1.0:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/shellwords/-/shellwords-0.1.1.tgz#d6b9181c1a48d397324c84871efbcfc73fc0654b"
 
-signal-exit@^3.0.0, signal-exit@^3.0.1, signal-exit@^3.0.2:
+signal-exit@^3.0.0, signal-exit@^3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/signal-exit/-/signal-exit-3.0.2.tgz#b5fdc08f1287ea1178628e415e25132b73646c6d"
 
@@ -3998,10 +4268,6 @@ slice-ansi@1.0.0:
   dependencies:
     is-fullwidth-code-point "^2.0.0"
 
-slide@^1.1.5:
-  version "1.1.6"
-  resolved "https://registry.yarnpkg.com/slide/-/slide-1.1.6.tgz#56eb027d65b4d2dce6cb2e2d32c4d4afc9e1d707"
-
 sntp@1.x.x:
   version "1.0.9"
   resolved "https://registry.yarnpkg.com/sntp/-/sntp-1.0.9.tgz#6541184cc90aeea6c6e7b35e2659082443c66198"
@@ -4038,11 +4304,11 @@ source-map@^0.4.4:
   dependencies:
     amdefine ">=0.0.4"
 
-source-map@^0.5.3, source-map@^0.5.6, source-map@~0.5.1, source-map@~0.5.6:
+source-map@^0.5.0, source-map@^0.5.3, source-map@^0.5.6, source-map@~0.5.1, source-map@~0.5.6:
   version "0.5.7"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.7.tgz#8a039d2d1021d22d1ea14c80d8ea468ba2ef3fcc"
 
-source-map@^0.6.0:
+source-map@^0.6.0, source-map@^0.6.1:
   version "0.6.1"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.6.1.tgz#74722af32e9614e9c287a8d0bbde48b5e2f1a263"
 
@@ -4207,6 +4473,12 @@ supports-color@^4.0.0, supports-color@^4.4.0:
   dependencies:
     has-flag "^2.0.0"
 
+supports-color@^5.4.0:
+  version "5.5.0"
+  resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-5.5.0.tgz#e2e69a44ac8772f78a1ec0b35b689df6530efc8f"
+  dependencies:
+    has-flag "^3.0.0"
+
 symbol-observable@1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/symbol-observable/-/symbol-observable-1.0.1.tgz#8340fc4702c3122df5d22288f88283f513d3fdd4"
@@ -4261,6 +4533,15 @@ test-exclude@^4.1.1:
     read-pkg-up "^1.0.1"
     require-main-filename "^1.0.1"
 
+test-exclude@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/test-exclude/-/test-exclude-5.0.0.tgz#cdce7cece785e0e829cd5c2b27baf18bc583cfb7"
+  dependencies:
+    arrify "^1.0.1"
+    minimatch "^3.0.4"
+    read-pkg-up "^4.0.0"
+    require-main-filename "^1.0.1"
+
 text-encoding@^0.6.4:
   version "0.6.4"
   resolved "https://registry.yarnpkg.com/text-encoding/-/text-encoding-0.6.4.tgz#e399a982257a276dae428bb92845cb71bdc26d19"
@@ -4385,6 +4666,10 @@ uuid@^3.0.0, uuid@^3.1.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/uuid/-/uuid-3.1.0.tgz#3dd3d3e790abc24d7b0d3a034ffababe28ebbc04"
 
+uuid@^3.3.2:
+  version "3.3.2"
+  resolved "https://registry.yarnpkg.com/uuid/-/uuid-3.3.2.tgz#1b4af4955eb3077c501c23872fc6513811587131"
+
 v8flags@^2.1.1:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/v8flags/-/v8flags-2.1.1.tgz#aab1a1fa30d45f88dd321148875ac02c0b55e5b4"
@@ -4491,15 +4776,7 @@ wrappy@1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/wrappy/-/wrappy-1.0.2.tgz#b5243d8f3ec1aa35f1364605bc0d1036e30ab69f"
 
-write-file-atomic@^1.1.4:
-  version "1.3.4"
-  resolved "https://registry.yarnpkg.com/write-file-atomic/-/write-file-atomic-1.3.4.tgz#f807a4f0b1d9e913ae7a48112e6cc3af1991b45f"
-  dependencies:
-    graceful-fs "^4.1.11"
-    imurmurhash "^0.1.4"
-    slide "^1.1.5"
-
-write-file-atomic@^2.1.0:
+write-file-atomic@^2.0.0, write-file-atomic@^2.1.0:
   version "2.3.0"
   resolved "https://registry.yarnpkg.com/write-file-atomic/-/write-file-atomic-2.3.0.tgz#1ff61575c2e2a4e8e510d6fa4e243cce183999ab"
   dependencies:
@@ -4531,6 +4808,29 @@ yargs-parser@^8.0.0:
   dependencies:
     camelcase "^4.1.0"
 
+yargs-parser@^9.0.2:
+  version "9.0.2"
+  resolved "https://registry.yarnpkg.com/yargs-parser/-/yargs-parser-9.0.2.tgz#9ccf6a43460fe4ed40a9bb68f48d43b8a68cc077"
+  dependencies:
+    camelcase "^4.1.0"
+
+yargs@11.1.0:
+  version "11.1.0"
+  resolved "https://registry.yarnpkg.com/yargs/-/yargs-11.1.0.tgz#90b869934ed6e871115ea2ff58b03f4724ed2d77"
+  dependencies:
+    cliui "^4.0.0"
+    decamelize "^1.1.1"
+    find-up "^2.1.0"
+    get-caller-file "^1.0.1"
+    os-locale "^2.0.0"
+    require-directory "^2.1.1"
+    require-main-filename "^1.0.1"
+    set-blocking "^2.0.0"
+    string-width "^2.0.0"
+    which-module "^2.0.0"
+    y18n "^3.2.1"
+    yargs-parser "^9.0.2"
+
 yargs@^10.0.3:
   version "10.0.3"
   resolved "https://registry.yarnpkg.com/yargs/-/yargs-10.0.3.tgz#6542debd9080ad517ec5048fb454efe9e4d4aaae"