request.data has become immutable under Django 1.11 for some reason.
Regardless, setting the 'id' key should be extraneous because we already
instruct the update method to use a specific pk (see kwargs) which
should be sufficient to locate the database record and update it.

with a custom patch needed by edx-platform.
Upgrade django-filter as well to v1.0.4
Import DjangoFilterBackend from the correct module - django_filter.
Add django-filter to INSTALLED_APPS.

This endpoint allows the Rapid Experiments Team to quickly update data for multiple learners.