title: How to "pull request" a specific commit
body: <p>I've got a specific commit which I would like to contribute to a repository I have forked on github.
  I assume the mechanism to do so is a "pull request".
  However when I try this I can only pull request my whole branch.
  I do not wish to pull request the other commits as they are not relevant.
  Any idea how I can do this.</p>
  
  <p><a href="https://i.stack.imgur.com/vrMob.png" rel="noreferrer"><img src="https://i.stack.imgur.com/vrMob.png" alt="repo I wish to pull request to."></a></p>
  
  <p>The last commit b50b2e7 is the only commit I wish to pull request.
  Anyway I can do this or are all commits dependent on each other?</p>
  
  <p><a href="https://i.stack.imgur.com/zwY1u.png" rel="noreferrer"><img src="https://i.stack.imgur.com/zwY1u.png" alt="commit I wish to pull request"></a></p>