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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.