Major release to remove deprecated supports
- Drop Python2 support, minimal Python version support is 3.5;
- Drop support for Django prior to 2.0;
- Drop support for django-crispy-forms prior to 1.8.1;
- Drop support for Foundation 5;
- Ensure support for Django 2.2 and 3.0;
- Ensure support for django-crispy-forms to 1.9.1;
- Removed everything about Foundation 5;