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.
- [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@v1.16.5...v3.1.11)

Author: dependabot[bot]

package.json

@@ -61,7 +61,7 @@
     "sass-loader": "^4.0.2",
     "style-loader": "^0.13.1",
     "webpack": "^1.13.2",
-    "webpack-dev-server": "^1.9.0"
+    "webpack-dev-server": "^3.1.11"
   },
   "dependencies": {
     "prop-types": "^15.5.10"