Django-app-settings

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- Deprecate loding setting values from environment (98 by stinovlas)
- Fix optional nested dict setting (92 by rastytheamateur)
- Fix typos in ``usage.rst`` (102 by oto-stefan)
- Fix docs build (100 by stinovlas)

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- Ignore environment variables when using ``override_settings``.
- Don't announce type annotations.

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- 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.

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- Fix ``transform_default`` in ``NestedListSetting``, by stinovlas (see PR `61`_).

.. _61: https://github.com/pawamoy/django-appsettings/issues/61

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- Add ``CallablePathSetting`` (see issue `49`_ and PR `52`_).
- Add ``NestedListSetting`` (see issue `50`_ and PR `53`_).
- Rename ``NestedSetting`` to ``NestedDictSetting`` (old name is still available but deprecated).

.. _49: https://github.com/pawamoy/django-appsettings/issues/49
.. _50: https://github.com/pawamoy/django-appsettings/issues/50
.. _52: https://github.com/pawamoy/django-appsettings/issues/52
.. _53: https://github.com/pawamoy/django-appsettings/issues/53

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- Fix default values for empty arguments.