message: Drop WIP PRs extension from Related section in readme
  WIP PRs are now offered natively by GitHub.
diff: @@ -224,7 +224,6 @@ See the [contribution guide](contributing.md) and join the [contributors](https:
  - [Awesome browser extensions for GitHub](https://github.com/stefanbuck/awesome-browser-extensions-for-github) - Awesome list
  - [Octo Linker](https://github.com/octo-linker/chrome-extension/) - Navigate across files and packages
  - [Notifier for GitHub](https://github.com/sindresorhus/notifier-for-github-chrome) - Shows your notification unread count
  -- [Do Not Merge WIP for GitHub](https://github.com/sanemat/do-not-merge-wip-for-github) - Prevents merging of incomplete PRs
  - [Contributors on GitHub](https://github.com/hzoo/contributors-on-github) - Shows stats about contributors
  - [Hide Files on GitHub](https://github.com/sindresorhus/hide-files-on-github) - Hides dotfiles from the file browser
  - [Twitter for GitHub](https://github.com/bevacqua/twitter-for-github) - Shows a user's Twitter handle on their profile page
  