fix(deps): update dependency yargs to v12.0.5 (#1707)

Author: renovate[bot]

package-lock.json

@@ -55,7 +55,7 @@
     "url": "^0.11.0",
     "webpack-dev-middleware": "^3.5.1",
     "webpack-log": "^2.0.0",
-    "yargs": "12.0.2"
+    "yargs": "12.0.5"
   },
   "devDependencies": {
     "@babel/cli": "^7.2.3",