title: How to push a single file in a subdirectory to Github (not master)
body: <p>I have changed a single file in a subdirectory of my repository and I want to push just that file to Github.  </p>
  
  <p>I've made a small change to one file, and I don't want to re-upload the entire repository.</p>
  
  <p>It seems like all of the instructions that I've seen so far require me to merge locally with the master and then push my local master to the remote origin. </p>
  
  <p>How can I push just that one file?  </p>