pending triggers error with 'manage.py migrate'

[Aaron Conole]

I'm trying to upgrade an older patchwork instance I have, and it seems
to be failing when I do a 'migrate' with the specific error:

django.db.utils.OperationalError: cannot ALTER TABLE "patchwork_series" because it has pending trigger events

I've made sure to update django-filter and django-filters to be up to
date, along with Django.  I must have missed a step somewhere, has this
been seen before?  Google search was not helpful, and my knowledge of
Django is pretty thin.

Thanks for any help,
-Aaron