Bump webpack-dev-server from 2.10.0 to 3.1.11

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 2.10.0 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@v2.10.0...v3.1.11)

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

Author: dependabot[bot]

package.json

@@ -82,7 +82,7 @@
     "uglifyjs-webpack-plugin": "^1.1.6",
     "url-loader": "^0.6.2",
     "webpack": "^3.10.0",
-    "webpack-dev-server": "^2.10.0",
+    "webpack-dev-server": "^3.1.11",
     "webpack-merge": "^4.1.1"
   }
 }