Django-configurations

- Test Django 3.2 on Python 3.10 as well.

- Test on PyPy 3.6, 3.7 and 3.8.

- Enforce Python version requirement during installation (>=3.6).

- Fix and refactor the documentation build process.

- **BACKWARD INCOMPATIBLE** Drop support for Python 2.7 and 3.5.

- **BACKWARD INCOMPATIBLE** Drop support for Django < 2.2.

- Add support for Django 3.1 and 3.2.

- Add suppport for Python 3.9 and 3.10.

- Deprecate ``utils.import_by_path`` in favor of ``django.utils.module_loading.import_string``.

- Add ASGI support.

- Added "python -m configurations" entry point.

- Make package ``install_requires`` include ``django>=2.2``.

- Prevent an ImproperlyConfigured warning from ``DEFAULT_HASHING_ALGORITHM``.

- Prevent warnings for settings deprecated in Django 2.2 (``DEFAULT_CONTENT_TYPE`` and ``FILE_CHARSET``).

- Preserve Django warnings when ``DEFAULT_AUTO_FIELD`` is not set.

- Miscellaneous documentation fixes.

- Miscellaneous internal improvements.

- **BACKWARD INCOMPATIBLE** Drop support of Python 3.3.

- **BACKWARD INCOMPATIBLE** Drop support of Django 1.9.

- Add support for Django 2.1.

- Add ``PositiveIntegerValue`` configuration value.

- Fix ``bool(BooleanValue)`` to behave as one would expect (e.g.
``bool(BooleanValue(False))`` returns ``False``).

- Miscellaneous documentation improvements and bug fixes.