Bump webpack-dev-server from 1.14.1 to 3.1.11

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 1.14.1 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](webpack/webpack-dev-server@v1.14.1...v3.1.11)

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

Author: dependabot[bot]

package.json

@@ -28,7 +28,7 @@
     "json-loader": "0.5.4",
     "url-loader": "0.5.7",
     "webpack": "1.13.2",
-    "webpack-dev-server": "1.14.1"
+    "webpack-dev-server": "3.1.11"
   },
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",