chore(package): update yargs to version 13.2.2

Closes #37

Author: greenkeeper[bot]

package.json

@@ -101,7 +101,7 @@
     "tsickle": "^0.33.1",
     "tslint": "^5.11.0",
     "typescript": "~3.1.6",
-    "yargs": "^12.0.5",
+    "yargs": "^13.2.2",
     "zone.js": "^0.8.26"
   },
   "engines": {