title: Renaming a base branch in github
body: <p>I am trying to correct a typo i.e. spelling mistake in the name of of github fork I have created. Drop a "t" from <code>gwt-hightchart-dashboard-demo</code> to <code>gwt-highchart-dashboard-demo</code></p>
  
  <p>I am not able to find out how to do this simple exercise after going through a few google/stackoverflow search. </p>
  
  <ol>
  <li>Is this possible? </li>
  <li>Is this possible via GitHub web GUI? How? </li>
  <li>Is this possible via GitHub Windows GUI? How? </li>
  <li>Is this possible via Git command prompt? How?</li>
  </ol>
  
  <p>Reference the image below.</p>
  
  <p><img src="https://i.stack.imgur.com/f6Suc.png" alt="enter image description here"></p>