title: How to get pull requests filter with owner using Github API
body: <p>I just want to query the PRs from a specific user.</p>
  
  <p>Do I need to use the <code>head</code> param? But how?</p>
  
  <p><code>https://api.github.com/repos/org-a/repo-b/pulls?state=open&amp;per_page=1&amp;head=owner:user-c</code> does not work.</p>
  
  <p>API Refer: <a href="https://developer.github.com/v3/pulls/#list-pull-requests" rel="noreferrer">https://developer.github.com/v3/pulls/#list-pull-requests</a></p>