I have a Django app which was spun out a while ago from the project it was originally built for, made into a separate standalone app, and put on PyPI (https://pypi.python.org/pypi/mysociety-django-images). The app is built expecting to be run with Django 1.7+.
I'd now like to make a change to one of the models there - just changing a max_length on a field. I can't see anything in the documentation about how to make a new migration for it? Do I need to make an example project and use that, or is there a better way?