Drop stub definitions for @types/commander

Author: jamesgeorge007

packages/cli/package.json

@@ -48,7 +48,6 @@
     "update-notifier": "^2.2.0"
   },
   "devDependencies": {
-    "@types/commander": "^2.9.1",
     "@types/filesize": "^3.6.0",
     "@types/fs-extra": "^3.0.3",
     "@types/humps": "^1.1.2",