Update commander to the latest version 🚀 (#1044)

* fix(package): update commander to version 2.20.0

* chore(package): update lockfile package-lock.json

Author: greenkeeper[bot]

package-lock.json

@@ -35,7 +35,7 @@
   "dependencies": {
     "bcryptjs": "2.3.0",
     "body-parser": "1.15.2",
-    "commander": "2.9.0",
+    "commander": "2.20.0",
     "connect-flash": "0.1.1",
     "cookie-session": "2.0.0-alpha.1",
     "create-react-class": "15.6.3",