Django-otp

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Removed obsolete compatibility shims. The testing and support matrix is
unchanged from 0.6.0, so there should be no impact.

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- Built-in :ref:`HOTP <hotp-devices>` and :ref:`TOTP <totp-devices>` devices are
now rate-limited, enforcing exponentially increasing delays between successive
failures. See the device documentation for information on presenting more
useful error messages when this happens, as well as for tuning (or disabling)
this behavior.

Thanks to Luke Plant for the idea and implementation.

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- Fix encoding of otpauth:// URL parameters.

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- Error messages in :class:`~django_otp.forms.OTPAuthenticationForm` and
:class:`~django_otp.forms.OTPTokenForm` can be customized.

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- Remove dependencies on old non-class login views.

- Drop support for Django < 1.11.

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- Fix return type of
:meth:`~django_otp.plugins.otp_static.models.StaticToken.random_token`.