------------------
Backwards-incompatible changes:
- Removed support for python 2.7 and 3.4
- Removed support for Django versions 1.8, 1.9, and 1.10.
New Features and Bugfixes:
- Add support for Django 2.1, 2.2, 3.0, 3.1, 3.2, and 4.0.
- Add support for Python 3.7, 3.8, 3.9, and 3.10.
- Multiline bug fix for SetupTools (61 and 67)
- Nested multiforms cleaned_data bug fix (69)