title: Get GitHub pull request difference summary through GraphQL
body: <p>I am trying to get the difference summary of a GitHub pull request through GraphQL.</p>
  <p>Usually we can get it through rest api call</p>
  <pre><code>GET https://github.com/owner/repo/pull/number.diff
  </code></pre>
  <p>and the response looks like this</p>
  <pre><code>diff --git a/main.py b/main.py
  index 7e8c7d4..08a53ce 100644
  --- a/main.py
  +++ b/main.py
  @@ -15,3 +15,5 @@ def dummy_load(secs: int) -&gt; None:
   if __name__ == &quot;__main__&quot;:
       mul = main(2)
       print(mul)
  +
  +# test comment
  </code></pre>
  <p>Is it possible to get the same result trough their GraphQL API</p>