title: Is there a way to make Github un-approve a pull request if a new commit is pushed to the branch?
body: <p>Using the new pull request approval process in Github, if I approve a PR but then a dev pushes a new commit to that branch I'd want the PR to go back to the state it is in to start with (i.e. not approved).</p>
  
  <p>At the moment it stays green but in reality there is code that hasn't been reviewed in the branch.</p>