* Add convert_choices_to_enum meta option
* Add tests
* Run black
* Update documentation
* Add link to Django choices documentation
* Add test and documentation note
That setting to an empty list is the same as setting the value as False
* Fix Django warning in tests
* rst is not markdown
* Update travis and tox
* Use xenial distribution
* Don't install coveralls twice
* Add black and flake8 tox commands
* Remove Python 3.5 test for Django master
* Fix indent
* Ignore migrations
* Remove black for now
* Run black formatting (#668)
* Run black format
* Update makefile
* Add black to travis build
* Allow for use of either filter_fields or filterset_class
* Add tests to check that the behavior is similar to filter_fields
* Add documentation to show how to make use of the parameter
Since they were only required for Django <1.8 and cause the following
deprecation warnings:
```
utils.py:61: RemovedInDjango20Warning: Usage of field.rel has been deprecated. Use field.remote_field instead.
if hasattr(field, 'rel'):
utils.py:63: RemovedInDjango20Warning: Usage of ForeignObjectRel.to attribute has been deprecated. Use the model attribute instead.
return field.rel.to
```
Fixes#242.
