==================
- Read setting values from environment variables.
- Add ``FileSetting``.
- Fix bug causing ``NestedDictSetting`` to be always required.
- Add support for python 3.8 and Django 3.0.
- Drop support for python 2.7 and 3.4.
- Drop deprecated type checkers.
- Add type annotations.
- Raise ``ImproperlyConfigured`` from ``Setting.check`` for all errors in a setting.
- Move repository to https://github.com/pawamoy/django-appsettings.
- Clean tests.