Django-otp-twilio

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TwilioSMSDevice is now a :class:`~django_otp.models.SideChannelDevice` and
implements :class:`~django_otp.models.ThrottlingMixin`.

This also drops support for old versions of Python (2.7) and Django (1.11,
2.1).

Note that this version includes migrations that will invalidate any in-flight
tokens.

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Build, test, and documentation cleanup.

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- Drop support for Django < 1.11.

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- Fix a spurious migration offered by makemigrations.

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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.