title: How to create tag automatically upon accepted merge request in GitLab?
body: <p>This is for a repository containing a library. The library version number is incremented (manually) each time a Merge Request to master is accepted.</p>
  <p>However, if I want to access a file from version X.Y.Z, I have to look for the commit that incremented the version number to X.Y.Z, get its date, and then look in the history of the file for the version at that date.</p>
  <p>I would like to create a tag per version, automatically when the Merge Request to master is created. Is this possible?</p>
  <p>I hoped it would be possible with the new <a href="http://docs.gitlab.com/ce/user/project/slash_commands.html" rel="nofollow noreferrer">GitLab slash commands</a>, but there currently is not support for tags.</p>
  <p>Is there any other possibility than using web hooks?</p>