[ci] Add pending migration check
[ci] Add pending migration check

Fixes #80
netjson/django-netjsongraph,interop-dev/django-netjsongraph,netjson/django-netjsongraph,interop-dev/django-netjsongraph,netjson/django-netjsongraph,netjson/django-netjsongraph,interop-dev/django-netjsongraph