old_contents: """Version string."""
  # main = X.Y.Z
  # sub = .devN for pre-alpha releases
  VERSION = '0.6.1'
  
new_contents: """Version string."""
  # main = X.Y.Z
  # sub = .devN for pre-alpha releases
  VERSION = '0.7.0'
  
subject: Bump version 0.7.0.