title: update package.json version automatically
body: <p>Before I do a small release and tag it, I'd like to update the package.json to reflect the new version of the program.</p>
  
  <p>Is there a way to edit the file <code>package.json</code> automatically?</p>
  
  <p>Would using a <code>git pre-release hook</code> help?</p>