[Security] Bump webpack-dev-server from 1.16.5 to 3.1.11

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 1.16.5 to 3.1.11. **This update includes security fixes.**
- [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/compare/v1.16.5...v3.1.11)

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

package.json

@@ -60,7 +60,7 @@
     "prettier": "^1.1.0",
     "rimraf": "^2.4.2",
     "webpack": "^1.10.5",
-    "webpack-dev-server": "^1.10.1",
+    "webpack-dev-server": "^3.1.11",
     "webpack-stream": "^2.1.0"
   }
 }