Migration breakage when switching from 'jsonfield' to django.db.models.JSONField #120
Description
When django-geojson switched the custom field from jsonfield to django.db.models.JSONField it broke migrations.
jsonfield used to create a text column for your json data when running 'makemigrations'. However, django.db.models.JSONField creates a json column using database-backend specific column types (ie jsonb on postgresql).
When upgrading this dependency I expected to have a new migrations when running makemigrations which would handle convert all my models geojson fields columns from text to jsonb.
No migrations were generated upon upgrading this package.