* Added support for Django 1.9, 1.10, 1.11, and 2.0.
* Dropped support for Django 1.7 and South.
* Dropped support for jingo_. Templates for the ``unsubscribe`` view are now
standard Django templates.
* Added ``Event.fire(delay=False)``, to avoid using the
pickle serializer, which has `security concerns`_.
* Added setting ``TIDINGS_TEMPLATE_EXTENSION`` to allow changing the
template extension used by the ``unsubscribe`` view from ``html`` to
``jinja``, ``j2``, etc.
* Migrated Watch.email from a maximum length of 75 to 254, to follow the
EmailField update in Django 1.8.
.. _`security concerns`: http://docs.celeryproject.org/en/latest/userguide/security.htmlserializers
.. _jingo: https://github.com/jbalogh/jingo