message: Readme: Update related extensions and sort by popularity
diff: @@ -345,16 +345,15 @@ See the [contribution guide](contributing.md) and join the [contributors](https:
  - [Notifier for GitHub](https://github.com/sindresorhus/notifier-for-github-chrome) - Shows your notification unread count
  - [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
  +- [GitHub Issue Link Status](https://github.com/fregante/github-issue-link-status) - Colorize issue and PR links to see their status (open, closed, merged)
  - [Twitter for GitHub](https://github.com/bevacqua/twitter-for-github) - Shows a user's Twitter handle on their profile page
  - [OctoEdit](https://github.com/DrewML/OctoEdit) - Markdown syntax highlighting in comments
  +- [Notifications Preview for GitHub](https://github.com/tanmayrajani/notifications-preview-github) - See your notifications on hover on all pages
  - [GitHub Custom Tab Size](https://github.com/lukechilds/github-custom-tab-size) - Set custom tab size for code views *(Refined GitHub hard-codes it to 4)*
  - [Show All GitHub Issues](https://github.com/sindresorhus/show-all-github-issues) - Shows both Issues and Pull Requests in the Issues tab
  -- [Notifications Preview for GitHub](https://github.com/tanmayrajani/notifications-preview-github) - See your notifications on hover on all pages
  - [Refined Twitter](https://github.com/sindresorhus/refined-twitter) - Improves Twitter
  -- [GitHub Issue Link Status](https://github.com/fregante/github-issue-link-status) - Colorize issue and PR links to see their status (open, closed, merged)
  - [Friendly GitHub](https://github.com/Hermanya/friendly-github) - Make GitHub more social
  -- [Sourcegraph](https://github.com/sourcegraph/browser-extensions) - Adds code intelligence to GitHub
  -- [Potential changes for GitHub](https://github.com/dzhavat/potential-changes-for-github) - See which pull requests contain changes related to a file
  +- [Sourcegraph](https://github.com/sourcegraph/sourcegraph/tree/master/browser) - Code search and navigation tool
  - [PR Monitor](https://github.com/fwouts/prmonitor) - Notifies you about incoming and outgoing PRs
  Want more? Here are some ideas you could develop!
  