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* Added test for Django 3 using Python 3.7 in tox.ini
* Improved performance of fake_text
* Improved performance of BaseAnonymizer.patch_object
* Fix bug with get_queryset not being treated as reserved name
* Improved performance of fake_username
* Removed rand_range argument from fake_username (backwards incompatible)
* Changed select_chunk_size and update_batch_size to saner defaults