Make SuccessMessageMixin fully compatible with FormMixin #86
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This ensures that the order in which these mixins are included into a derrived class does not matter and ends up more accurately reflecting the return type of SuccessMessageMixin in the process (its code doesn't appear to enforce that the returned response is a redirect).
This provides a fix to a secondary aspect of https://github.com/mkurnikov/django-stubs/issues/79.