title: Update a gist through its API
body: <p>I'm trying to edit an existing Gist through an API call, following the API docs, I'm doing a curl call like this:</p>
  
  <p><code>curl -X PATCH -d'{"description": "the description for this gist", "files": {"file1.txt": {"content": "updated file contents"}}}' https://api.github.com/gists/5790365</code></p>
  
  <p>But it keeps returning a 'Not Found' error.</p>
  
  <p>Am I missing something here?</p>