Incompatible with Django 3

[Tecktron]

'ENGINE': 'django.db.backends.postgresql_psycopg2', is deprecated and has been removed in Django 3 making this no longer compatible with Django 3.

There's an open PR open to fix the issue:
#96

[jimfunk]

This has just now been merged and released as 1.2.0. Sorry about the delay.

[jaychoo]

@jimfunk another Django 3 compatibility issue

from django.utils.six import with_metaclass, text_type
--
120 | ModuleNotFoundError: No module named 'django.utils.six'