old_contents: from django.conf import settings
  from libs.djpubsubhubbub.models import Subscription
  
  sub = Subscription.objects.subscribe(
      topic='http://push-pub.appspot.com/feed/',
      hub=settings.SUPERFEEDR_HUB,
      debug=True
  )
  
new_contents: from django.conf import settings
  from libs.djpubsubhubbub.models import Subscription
  
  sub = Subscription.objects.subscribe(
      topic='http://push-pub.appspot.com/feed',
      hub=settings.SUPERFEEDR_HUB,
      debug=True,
      verify='async'
  )
  
subject: Update subscribe tester