4.2

• Django 2.1 compatibility
• Python 3.7 compatibility
• Implemented prefetch_related on FakeQuerySet (Haydn Greatnews)
• Fix: Saving a ClusterableModel with a primary key of 0 no longer throws an IntegrityError (A Lee)
• Fix: Serialization now respects serialize=False on ParentalManyToManyFields (Tadas Dailyda)