build(deps-dev): bump webpack-dev-server in /examples/storybook (kazu…

…pon#763)

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 2.11.5 to 3.10.1.
- [Release notes](https://github.com/webpack/webpack-dev-server/releases)
- [Changelog](https://github.com/webpack/webpack-dev-server/blob/v3.10.1/CHANGELOG.md)
- [Commits](https://github.com/webpack/webpack-dev-server/commits/v3.10.1)

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

examples/storybook/package.json

@@ -24,7 +24,7 @@
     "vue-loader": "^12.1.0",
     "vue-template-compiler": "^2.4.2",
     "webpack": "^2.6.1",
-    "webpack-dev-server": "^2.4.5",
+    "webpack-dev-server": "^3.10.1",
     "@storybook/vue": "^3.2.3"
   }
 }