State the Django and Python Version

[mslinn]

Neither the article nor the README for this project states the version of Django that this project works on. I found a migration that said Generated by Django 2.1.4 on 2018-12-16 19:11.

So the article should state right up top: "This project works with Django 2.1.4 and may require modifications to work with later versions of Django." Same message for this project's README.

The current version of Django is 3.1, which means breaking changes have been introduced since the article was written more than 2 years ago.