title: my old username is still in use
body: <p>I have changed my user and email for git with those commands</p>
  
  <pre><code>git config --global user.name "maa"
  git config user.email "maa@gmail.com"
  </code></pre>
  
  <p>I confirmed the change with </p>
  
  <pre><code>git config --global user.name
  git config user.email
  </code></pre>
  
  <p>and it shows the right names. 
  However when I push the old user name is used:</p>
  
  <pre><code>git push -u origin master
  remote: Permission to maa/brain.git denied to old_user_name.
  fatal: unable to access 'https://github.com/maa/brain.git/': The requested URL returned error: 403
  </code></pre>