old_contents: from pkg_resources import get_distribution, DistributionNotFound
  
  try:
      __version__ = get_distribution("django-rest-framework-simplejwt").version
  except DistributionNotFound:
      # package is not installed
      __version__ = None
  
new_contents: from pkg_resources import get_distribution, DistributionNotFound
  
  try:
      __version__ = get_distribution("djangorestframework_simplejwt").version
  except DistributionNotFound:
      # package is not installed
      __version__ = None
  
subject: Fix name of package.