title: Hook event for git tag created / tag pushed
body: <p>I am looking at the bitbucket API v2:
  <a href="https://developer.atlassian.com/bitbucket/api/2/reference/resource/hook_events" rel="nofollow noreferrer">https://developer.atlassian.com/bitbucket/api/2/reference/resource/hook_events</a></p>
  
  <p>it says the hook events are:</p>
  
  <pre><code>issue:comment_created
  issue:created
  issue:updated
  project:updated
  pullrequest:approved
  pullrequest:comment_created
  pullrequest:comment_deleted
  pullrequest:comment_updated
  pullrequest:created
  pullrequest:fulfilled
  pullrequest:rejected
  pullrequest:unapproved
  pullrequest:updated
  repo:commit_comment_created
  repo:commit_status_created
  repo:commit_status_updated
  repo:created
  repo:deleted
  repo:fork
  repo:imported
  repo:push
  repo:transfer
  repo:updated
  </code></pre>
  
  <p>that's right, I sorted the list for them. Anyway, my question is - how can I know if a <strong>git tag</strong> was created? I am looking to discover when a tag is created/pushed to the bitbucket remote. Anyone know?</p>