title: How to delete history of deleted commit?
body: <p>I would like to find a way to remove commit history remaining in github.</p>
  
  <p>I've fork a repository to do some work. I forgot to set config of name and email. </p>
  
  <p>Therefore, for the first commit, it is pushed with incorrect credential.</p>
  
  <p>I fix it by rebase, and the commit is deleted. I push again, so I cannot see that pushed in the git log.</p>
  
  <p>However, the history of the first pushed is still shown in the github. This is because I refer to the issue number of the forked repository.</p>
  
  <p>Is there a way to remove that history from github?</p>