Django-otp

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- `137`_: Add TimestampMixin

Add a new TimestampMixin with ``created_at`` and ``last_used_at`` fields for
device models.

All builtin plugins now have these timestamp fields and require migrating.

- Some documentation cleanup.

.. _137: https://github.com/django-otp/django-otp/pull/137

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- `122`_: Added throttling to token generation.

Devices that generate random tokens can take advantage of the new
:class:`~django_otp.models.CooldownMixin` to enforce limits on how frequently
new tokens can be generated (and presumably delivered).
:class:`~django_otp.plugins.otp_email.models.EmailDevice` uses this and has a
:setting:`default cooldown <OTP_EMAIL_COOLDOWN_DURATION>` configured.

Thanks to `Demetris Stavrou`_ for this feature.

- Note: :class:`~django_otp.models.VerifyNotAllowed` is now an
:class:`~enum.Enum`. This will break any code that inadvisably hard-coded the
string value of the `N_FAILED_ATTEMPTS` property.

.. _122: https://github.com/django-otp/django-otp/pull/122
.. _Demetris Stavrou: https://github.com/demestav

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- `133`_: Add pt-PT translation.

.. _133: https://github.com/django-otp/django-otp/pull/133

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- `131`_: Fix German translation

.. _131: https://github.com/django-otp/django-otp/pull/131

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- `125`_: Support email body_html templates

.. _125: https://github.com/django-otp/django-otp/pull/125

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- `124`_: Add pt-BR translations.

.. _124: https://github.com/django-otp/django-otp/pull/124