old_contents: # version contains Year and Month of API actualization
  # last part is minor update, if needed
  VERSION = (2018, 5, 0)
  
  
  def get_version(version=None):
      """Derives a PEP386-compliant version number from VERSION."""
  
      if version is None:
          version = VERSION
  
      return '.'.join(str(x) for x in version)
  
new_contents: # version contains Year and Month of API actualization
  # last part is minor update, if needed
  VERSION = (2021, 10, 0)
  
  
  def get_version(version=None):
      """Derives a PEP386-compliant version number from VERSION."""
  
      if version is None:
          version = VERSION
  
      return '.'.join(str(x) for x in version)
  
subject: bump version