title: get size of commit from github api
body: <p>I've been looking through the Github API trying to work out it there's a simple way to get the size of a commit, i.e. what's the amount of change that took place:</p>
  
  <p><a href="https://developer.github.com/v3/repos/commits/" rel="nofollow noreferrer">https://developer.github.com/v3/repos/commits/</a></p>
  
  <p>My google and stackoverflow searches turned up:</p>
  
  <p><a href="https://stackoverflow.com/questions/10845051/git-show-total-file-size-difference-between-two-commits">Git: show total file size difference between two commits?</a></p>
  
  <p>and a few other command line options, but I wonder if anyone knows of a good way to do this through the Github API?</p>
  
  <p>Many thanks in advance</p>