Replace the removed ForeignKey.rel.to attribute
Replace the removed ForeignKey.rel.to attribute

Django 1.9 introduced the ForeignKey.remote_field attribute and
deprecated the old ForeignKey.rel attribute. In 2.0 the rel attribute
was removed.

django-treebeard/django-treebeard,tabo/django-treebeard,django-treebeard/django-treebeard,django-treebeard/django-treebeard,tabo/django-treebeard,tabo/django-treebeard,tabo/django-treebeard