old_contents: from django.conf import settings
  
  from appconf import AppConf
  
  
  class Open511Settings(AppConf):
  
      ENABLE_TEST_ENDPOINT = False
      DEFAULT_VERSION = 'v0'
  
      class Meta:
          prefix = 'OPEN511'
  
new_contents: from django.conf import settings
  
  from appconf import AppConf
  
  
  class Open511Settings(AppConf):
  
      ENABLE_TEST_ENDPOINT = False
      DEFAULT_VERSION = 'v1'
  
      class Meta:
          prefix = 'OPEN511'
  
subject: Update version string