title: Accepted merge requests author not shown as contributor
body: <p>Recently I've started a new open source android project on GitHub (<a href="https://github.com/ardovic/Open-Weather-App" rel="nofollow noreferrer">Open Weather App</a>). One person forked the repository and made some changes, then he created a pull request and I accepted it by pressing this green button:</p>
  
  <p><a href="https://i.stack.imgur.com/flijd.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/flijd.png" alt="enter image description here"></a></p>
  
  <p>Everything worked just fine, the pull request was merged into master. However, the problem is that he did not appear in the contributors list. It still does say 1 contributor, which is me: </p>
  
  <p><a href="https://i.stack.imgur.com/Dxdy1.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Dxdy1.png" alt="enter image description here"></a></p>
  
  <p><strong>What could be the reason for him not to appear on the list, and how can I solve this issue?</strong> </p>
  
  <p>I feel responsibility for him. I even added him to collaborators list, yet he still does not appear as a contributor. </p>