chore(deps): update dependency webpack-dev-server to v2.11.4

Author: renovate-bot

advanced/package.json

@@ -61,7 +61,7 @@
     "vue-template-compiler": "2.6.8",
     "webpack": "3.12.0",
     "webpack-bundle-analyzer": "2.13.1",
-    "webpack-dev-server": "2.11.3",
+    "webpack-dev-server": "2.11.4",
     "webpack-merge": "4.2.1"
   },
   "engines": {