Merge pull request #704 from pjonsson/update-webpack-dev-server

Update to webpack-dev-server 4.15.2

Author: na9da

package.json

@@ -89,8 +89,8 @@
     "urijs": "^1.18.12",
     "url-loader": "^1.1.2",
     "webpack": "~4.47.0",
-    "webpack-cli": "^3.3.11",
-    "webpack-dev-server": "^3.1.14",
+    "webpack-cli": "^4.10.0",
+    "webpack-dev-server": "^4.15.2",
     "yargs": "^17.7.2"
   },
   "scripts": {