old_contents: """Set package version."""
  
  # See https://packaging.python.org/guides/single-sourcing-package-version"""
  __version__ = '0.1.1'
  
new_contents: """Set package version."""
  
  # See https://packaging.python.org/guides/single-sourcing-package-version"""
  __version__ = '0.1.2'
  
subject: Increment version