title: Mercurial: Correct an already pushed tag-name
body: <p>is there any solution to correct an already pushed tag-name? 
  I pushed a tag-name with a faulty version-number. It's not terrible problematic, but if there was a way to correct the tag-name, I'd be thankful if you could tell me more. :)</p>
  
  <p>Thanks a lot for any hint!</p>