old_contents: # python package version
  # should match r"^__version__ = '(?P<version>[^']+)'$" for setup.py
  __version__ = "0.2.8-rc1"
  
new_contents: # python package version
  # should match r"^__version__ = '(?P<version>[^']+)'$" for setup.py
  __version__ = "0.2.8-rc2"
  
subject: bump rc number