Problem when upgrading to django 1.11: context must be a dict rather than Context.

[coolmaksat]

template render function requires context to be dict in django 1.11
Traceback:

File "/venv/local/lib/python2.7/site-packages/mailviews/messages.py" in send
82. message = self.render_to_message(extra_context=extra_context, **kwargs)

File "/venv/local/lib/python2.7/site-packages/mailviews/messages.py" in render_to_message
60. subject=self.render_subject(context),

File "//venv/local/lib/python2.7/site-packages/mailviews/messages.py" in render_subject
161. rendered = self.subject_template.render(unescape(context))

File "/venv/local/lib/python2.7/site-packages/django/template/backends/django.py" in render
64. context = make_context(context, request, autoescape=self.backend.engine.autoescape)

File "/venv/local/lib/python2.7/site-packages/django/template/context.py" in make_context
287. raise TypeError('context must be a dict rather than %s.' % context.class.name)

Exception Type: TypeError at /accounts/request/demo/
Exception Value: context must be a dict rather than Context.