old_contents: __version__ = '2.0.0.0'
  # master branch version is the one of the previous release. 
  # version is bumped when released is done (new branch is created)
  
  
new_contents: __version__ = '2.1.0.0'
  # master branch version is the one of the previous release. 
  # version is bumped when released is done (new branch is created)
  
  
subject: Prepare development for version 2.1