title: Auto-closing Github issues is not working
body: <p>I never managed to close a Github issue, here is an example that I previously had:</p>
  
  <ul>
  <li>I have only a <code>master</code> branch</li>
  <li>I have an issue <code>#15</code></li>
  <li>I did the following commit message <code> ESLint rules updated, this closes issue #15</code></li>
  <li>I pushed it and I see the following message in the issue: <code>sandoche added a commit that referenced this issue 4 minutes ago</code> but the issue is still opened</li>
  </ul>
  
  <p>What did I do wrong ?</p>