Django-trench

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* Changed `n` time-windows of 1 second intervals to a single time window of `n` seconds interval
* Tests refactoring

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* Support for Python >=3.7 only (older versions are not maintained anymore)
* Abandoned support of the :code:`django-rest-framework-jwt` library as it is no longer maintained.
* Used :code:`black` tool for auto code formatting.
* Type hints added.
* Backwards-compatible code refactoring and cleanup for better maintenance experience.
* Deactivation of primary MFA method would raise an error instead of randomly selecting new primary method from all active ones.
* Twilio backend client should be configured via environment variables instead of backend's configuration the `TWILIO_ACCOUNT_SID` and `TWILIO_AUTH_TOKEN`.
* :code:`djoser` integration abandoned due to infrequent updates of the library. Djoser's auth links are no longer supported.

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* Add possibility to override default trench templates for ``SendMailBackend``.
* Remove six.test_type from ``ObtainJSONWebTokenMixin``.
* Store YubiKey ``device_id`` directly in MFAMethod model.
* Make default backup codes more secure, increase backup codes length from 6 to 12 and extend backup codes characters from only digits to ascii_letters also.
* Bump versions of packages.
* Add support for Django 3.0, Python 3.8 and DRF 3.10.
* Remove support for Python 3.4.

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* Fix missing ``_action method`` on Token Based Authentication views.
* Bump up supported djoser version.
* Add DRF 3.9 and Django 2.2 to test environment.
* Add locale directory to distribution package.
* Change url patterns and add exception handling for method activation views.

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* Add setting for secret_key_length and set it to default of 16.
* Replace split method on ephemeral_token with rsplit.
* Add AllowAny to the mixins for login views.
* Change ``_backup_codes`` to TextField.

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* Add auth backend for YubiKey.
* Change default email backend to Django's built-in.
* Add sms auth backend for smsapi.pl.
* Add support for Simple JWT.
* Add encryption for backup codes with customisation setting.
* Update translations.
* Add Transifex for translations.
* Add flake8 and isort to tox tests.
* Change default settings to more verbose.
* Fix setup to install only trench package.
* Fix pytest import mistmatch error when running test in Docker.