from Github - Reverting a pull request

1. Under your repository name, click Pull requests.

2. In the "Pull Requests" list, click the pull request you'd like to revert.
3. Near the bottom of the pull request, click Revert. If the Revert option isn't displayed, you'll need to ask the repository administrator for write permissions.

4. Merge the resulting pull request. For more information, see "Merging a pull request."