title: How to list only file names that have changed between two branches
body: <p>I have two branches in my repository which I want to diff for some files.</p>
  
  <p>I want to list only newly added migrations between those two branches.</p>
  
  <p>Something like:</p>
  
  <pre><code>git diff branch1 branch2 | grep /db/migrate
  </code></pre>
  
  <p>How can I do it?</p>