title: How to use git log --oneline in gitpython
body: <p>I'm trying to extract list of commit messages by giving a start sha &amp; end sha. It's easy in git using git log. 
  But am trying to do it through gitpython library.
  Could someone help me to achieve this?</p>
  
  <p>in Git the command is like this :</p>
  
  <p><code>git log --oneline d3513dbb9f5..598d268f</code></p>
  
  <p>how do i do it with gitpython?</p>