title: "Update" button disabled in GitHub Desktop
body: <p>I'm using GitHub Desktop for code management. I've created a branch for some code changes to my project, I've committed those changes, and now I want to merge the branch back to the master branch. The <a href="https://help.github.com/desktop/guides/contributing/syncing-your-branch/" rel="nofollow noreferrer">GitHub instructions for doing this</a> indicate I need to click the "Update to master" button to perform the merge. Unfortunately, that button is disabled in my case. If I hover over the "Update to master" button the tooltip states " is up to date with master". Yet if I switch back to the master branch it is clear my code changes are not yet in the master branch.</p>
  
  <p>Does anyone know what I might be doing wrong? How can I convince GitHub Desktop that my code changes do indeed need to be merged to the master branch?</p>