Bump webpack-dev-server from 2.11.5 to 3.1.11

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 2.11.5 to 3.1.11.
- [Release notes](https://github.com/webpack/webpack-dev-server/releases)
- [Changelog](https://github.com/webpack/webpack-dev-server/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack/webpack-dev-server/commits/v3.1.11)

---
updated-dependencies:
- dependency-name: webpack-dev-server
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -96,7 +96,7 @@
     "webpack": "^3.8.1",
     "webpack-bundle-analyzer": "^2.9.1",
     "webpack-cordova-plugin": "^0.1.6",
-    "webpack-dev-server": "^2.9.4",
+    "webpack-dev-server": "^3.1.11",
     "worker-loader": "^1.1.0"
   },
   "repository": {