title: Cannot push to Git after using new username
body: <p>I was using another <code>user.name</code> and <code>user.email</code>, and I changed my <code>user.name</code> and <code>user.email</code> for this current repo. Now, I cannot push to the repo. I am etting the following message:</p>
  
  <pre><code>$ git push
  remote: Permission to rrick3456/JS-Koans.git denied to rperro.
  fatal: unable to access 'https://github.com/rrick3456/JS-Koans.git/': The requested URL returned error: 403
  $
  </code></pre>
  
  <p>I did a <code>git config --list</code> to make sure the username and email were correct.  </p>