fix(package): update commander to version 4.1.1

Closes #26

Author: greenkeeper[bot]

package.json

@@ -17,7 +17,7 @@
   "dependencies": {
     "cheerio": "^0.22.0",
     "cli-table": "^0.3.1",
-    "commander": "^3.0.0",
+    "commander": "^4.1.1",
     "lodash": "^4.17.11",
     "superagent": "^5.1.0"
   },