chore(package): update yargs to version 13.3.0

Closes #15

Author: greenkeeper[bot]

package.json

@@ -106,7 +106,7 @@
     "tslint": "~5.12.1",
     "typescript": "~3.2.4",
     "webpack-node-externals": "^1.7.2",
-    "yargs": "12.0.5",
+    "yargs": "13.3.0",
     "zone.js": "^0.8.26"
   },
   "engines": {