Update UniqueFieldsMixin to support DRF 3.11 validator context API #96
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DRF 3.11 changed how context is passed into validators to fix a race-condition, as described in the following links
set_context()
encode/django-rest-framework#7062This PR provides support for this new API in a backwards-compatible way, using
set_context
if available/on older DRF, and passing the field in with the__call__
if not.