Merge pull request #13 from ekros/dependabot/npm_and_yarn/webpack-dev-server-3.1.11

Bump webpack-dev-server from 2.9.4 to 3.1.11

Author: ekros

package.json

@@ -57,7 +57,7 @@
     "sw-precache-webpack-plugin": "0.11.4",
     "url-loader": "0.6.2",
     "webpack": "3.8.1",
-    "webpack-dev-server": "2.9.4",
+    "webpack-dev-server": "3.1.11",
     "webpack-manifest-plugin": "1.3.2",
     "whatwg-fetch": "2.0.3"
   },