Bump webpack-dev-server from 1.16.2 to 3.1.11

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 1.16.2 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@v1.16.2...v3.1.11)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package.json

@@ -68,7 +68,7 @@
     "stylus-loader": "^2.3.1",
     "url-loader": "0.5.7",
     "webpack": "1.14.0",
-    "webpack-dev-server": "1.16.2",
+    "webpack-dev-server": "3.1.11",
     "webpack-manifest-plugin": "1.1.0",
     "whatwg-fetch": "1.0.0"
   },