title: Is there anyway to get notified when a ref gets updated in JGit?
body: <p>Is there any way to get notified, when I add/update/delete a ref in the bare git repository? Maybe through listener or any other way in JGit. I see <code>org.eclipse.jgit.events.RefsChangedListener</code> and <code>org.eclipse.jgit.events.RefsChangedEvent</code>. However, <code>RefsChangedEvent</code> doesn't seem to give useful information like which ref got affected and what was the type of change to ref.</p>
  <p>Basically, I need to perform some operation after a particular ref gets updated.</p>
  <p>Any hints will be useful.</p>