title: Cant commit after starting a merge in Sourcetree
body: <p>When trying to commit after a merge I'm getting this error message:</p>
  
  <blockquote>
    <p>"fatal: You are in the middle of a merge -- cannot amend."</p>
  </blockquote>
  
  <p>How do i resolve this? as far as I know I have resolved all conflicts, i just need to complete the merge and commit the changes. but the product won't let me and doesn't give me any clues as to what I am meant to do next, and there is no option to "complete the merge"</p>
  
  <p>Everytime I try to commit my changes I get the error message and I now have no idea what to do about it! </p>