Upgrade yargs 12.0.5 -> 13.1.0

Author: ehmicky

package-lock.json

@@ -51,7 +51,7 @@
     "swagger-parser": "^6.0.5",
     "type-is": "^1.6.16",
     "underscore.string": "^3.3.5",
-    "yargs": "^12.0.5"
+    "yargs": "^13.1.0"
   },
   "devDependencies": {
     "eslint": "^5.13.0",