fix(package): update cuid to version 2.1.8

Closes #17

Author: greenkeeper[bot]

package.json

@@ -26,7 +26,7 @@
   "dependencies": {
     "babel-polyfill": "^6.16.0",
     "bluebird": "3.4.7",
-    "cuid": "^1.3.8",
+    "cuid": "^2.1.8",
     "es6-enum": "^1.1.0",
     "lodash": "^4.17.2",
     "path": "^0.12.7",