chore(deps): update dependency webpack-dev-server to v3.1.9

Author: renovate-bot

package.json

@@ -64,7 +64,7 @@
     "url-loader": "1.0.1",
     "webpack": "4.6.0",
     "webpack-cli": "2.1.2",
-    "webpack-dev-server": "3.1.3"
+    "webpack-dev-server": "3.1.9"
   },
   "dependencies": {
     "antd": "3.4.4",