fix(package): update commander to version 3.0.2

Closes #61

Author: greenkeeper[bot]

package.json

@@ -60,7 +60,7 @@
     "lib": "lib"
   },
   "dependencies": {
-    "commander": "^2.19.0",
+    "commander": "^3.0.2",
     "express": "^4.16.4"
   },
   "devDependencies": {