fix(package): update commander to version 5.1.0

Closes #24

Author: greenkeeper[bot]

package.json

@@ -39,7 +39,7 @@
         "babel-polyfill": "^6.26.0",
         "cli-table2": "^0.2.0",
         "colors": "^1.1.2",
-        "commander": "^2.14.1",
+        "commander": "^5.1.0",
         "configstore": "^3.1.1",
         "flat": "^4.0.0",
         "inquirer": "^3.3.0",