The review summary text area for pull requests has been changed to include a preview tab as well as a text editing toolbar. This will give you more confidence in how your review will be displayed as well as quick access to various text editing tools such as saved replies and more.
GitHub Services can no longer be added to a repository
As we announced back in April, starting today, additional GitHub Services cannot be added to any repository on GitHub.com, via the UI or API. You can continue to edit or delete existing GitHub Services.