old_contents: # It is important to store the version number in a separate file
  # so that we can read it from setup.py without importing the package
  __version__ = "6.2.0"
  
new_contents: # It is important to store the version number in a separate file
  # so that we can read it from setup.py without importing the package
  __version__ = "6.3.dev0"
  
subject: Bump version to v6.3.dev0