Removed ``blank=True`` from the ``change_date`` field of the Record model.
Removed ``blank=True`` from the ``change_date`` field of the Record model.

gnotaras/django-powerdns-manager,kumina/django-powerdns-manager,d9pouces/django-powerdns-manager,d9pouces/django-powerdns-manager,gnotaras/django-powerdns-manager,kumina/django-powerdns-manager