old_contents: __version__ = '1.7.3'
  __copyright__ = 'Copyright (c) 2020, Skioo SA'
  __licence__ = 'MIT'
  __URL__ = 'https://github.com/skioo/django-customer-billing'
  
new_contents: __version__ = '1.7.4'
  __copyright__ = 'Copyright (c) 2020, Skioo SA'
  __licence__ = 'MIT'
  __URL__ = 'https://github.com/skioo/django-customer-billing'
  
subject: Update version to 1.7.4