title: Get pull request subject/topic automatically
body: <p>I would like to create automated release notes based on the Pull Request description like "Add legal resolutions claim report function" on the screen below.</p>
  
  <p>I'm not very good with Pull Requests and not even sure is that "description" is Bitbucket only functionality. However the question is how can I automatically get this description from Pull Request? I couldn't find anywhere in the commits messages.</p>
  
  <p><a href="https://i.stack.imgur.com/DT8zq.png" rel="noreferrer"><img src="https://i.stack.imgur.com/DT8zq.png" alt="enter image description here"></a></p>