chore(deps): update dependency webpack-dev-server to v3.11.0

Author: renovate-bot

package.json

@@ -46,7 +46,7 @@
     "vue-template-compiler": "2.6.9",
     "webpack-cli": "3.3.0",
     "webpack": "4.29.6",
-    "webpack-dev-server": "3.2.1"
+    "webpack-dev-server": "3.11.0"
   },
   "dependencies": {
     "vue": "^2.5.16",