title: How to restrict who can merge to master on a github repo?
body: <p>I have setup on my Github repo
  a branch protection rule on master branch checking (activating) the following:</p>
  <ul>
  <li>Require pull request reviews before merging</li>
  <li>Required approving reviewers : 1</li>
  <li>Include administrators</li>
  <li>Restrict who can push to matching branches</li>
  </ul>
  <p>I'm then in a situation that at least one from the team must approve a PR before someone can merge its own dev branch to master.</p>
  <p>Apart from the above I would also want to select only some people that will have the permission to merge the reviewed and approved PR.
  Not everyone having access to the repo.</p>
  <p>Is it possible to set this up?</p>