Django-otp-yubikey

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- Drop support for Django < 1.11.

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- Resolve deprecation warnings for forward compatibility.

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- Fix `25`_: make sure default keys are unicode values.

.. _25: https://bitbucket.org/psagers/django-otp/issues/25/attributeerror-bytes-object-has-no

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- Drop support for versions of Django that are past EOL.

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- Treat :attr:`~django.contrib.auth.models.User.is_authenticated` and
:attr:`~django.contrib.auth.models.User.is_anonymous` as properties in Django
1.10 and later.

- Add explict on_delete behavior for all foreign keys.

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- Fix for YubiKey token encoding on Python 3.


v0.3.3 - January 10, 2016 - Python 3 cleanup
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- All modules include all four Python 3 __future__ imports for consistency.

- Migrations no longer have byte strings in them.