Bump webpack-dev-server from 3.1.4 to 3.1.11

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 3.1.4 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@v3.1.4...v3.1.11)

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

package.json

@@ -27,7 +27,7 @@
     "web3": "^0.20.1",
     "webpack": "^4.12.0",
     "webpack-cli": "^3.0.8",
-    "webpack-dev-server": "^3.1.4",
+    "webpack-dev-server": "^3.1.11",
     "webpack-shell-plugin": "^0.5.0"
   },
   "dependencies": {