old_contents: MAJOR_VERSION = 2
  MINOR_VERSION = 2
  VERSION = "{MAJOR_VERSION}.{MINOR_VERSION}".format_map(locals())
  
new_contents: MAJOR_VERSION = 2
  MINOR_VERSION = 3
  VERSION = "{MAJOR_VERSION}.{MINOR_VERSION}".format_map(locals())
  
subject: Bump version 2.3