Update webpack-dev-server requirement from 1.14.1 to 1.16.5

Updates the requirements on [webpack-dev-server](https://github.com/webpack/webpack-dev-server) to permit the latest version.
- [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...v1.16.5)

Author: dependabot-preview[bot]

package.json

@@ -34,7 +34,7 @@
     "react-dom": "15.3.0",
     "react-hot-loader": "1.3.0",
     "webpack": "1.13.1",
-    "webpack-dev-server": "1.14.1"
+    "webpack-dev-server": "1.16.5"
   },
   "dependencies": {
     "prop-types": "15.5.10"