问题
Once a pull request is approved, if there are further commits:
The Pull request should go to un-approved state automatically.
Can this be done?
回答1:
The ability to Dismiss stale pull request approvals when new commits are pushed is a setting under Require pull request reviews before merging in the branch protection settings. This is disabled by default.
回答2:
This isn't currently offered.
You can create an application that listens for push webhook events, queries the API for all Reviews for a Pull Request, and dismisses any that are APPROVED.
Here is a Ruby script you could host on heroku.
来源：https://stackoverflow.com/questions/41824374/how-to-un-approve-github-review-after-new-commits-automatically