old_contents: # TODO: Fetch master branch of a repository repeatedly and detect merges
  # into master.
  # TODO: Detect tag creation.
  # TODO: Detect feature branch creation.
  
new_contents: # TODO: Fetch master branch of a repository repeatedly and detect merges
  # into master.
  # TODO: Detect tag creation.
  # TODO: Detect feature branch creation.
  # http://gitpython.readthedocs.io/en/stable/tutorial.html#meet-the-repo-type
  
subject: add tutorial link