Update django-configurations to 2.3

[pyup-bot]

This PR updates django-configurations from 2.0 to 2.3.

Changelog

2.3

^^^^^^^^^^^^^^^^^

- **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.

2.2

^^^^^^^^^^^^^^^^^

- **BACKWARD INCOMPATIBLE** Drop support for Python 3.4.

- **BACKWARD INCOMPATIBLE** Drop support for Django < 1.11.

- Add support for Django 3.0.

- Add support for Python 3.8.

- Add support for PyPy 3.

- Replace ``django.utils.six`` with ``six`` to support Django >= 3.

- Start using tox-travis and setuptools-scm for simplified test harness
and release management.

2.1

^^^^^^^^^^^^^^^^^

- **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.

Links

• PyPI: https://pypi.org/project/django-configurations
• Changelog: https://pyup.io/changelogs/django-configurations/
• Docs: https://django-configurations.readthedocs.io/

[pyup-bot]

Closing this in favor of #1497