build(deps-dev): bump webpack-dev-server from 2.11.2 to 3.1.11

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 2.11.2 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@v2.11.2...v3.1.11)

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

Author: dependabot[bot]

package.json

@@ -44,7 +44,7 @@
     "react": "^15.6.1",
     "react-dom": "^15.6.1",
     "webpack": "^3.0.0",
-    "webpack-dev-server": "^2.5.0"
+    "webpack-dev-server": "^3.1.11"
   },
   "dependencies": {
     "kits-js": "^0.0.7",