Fixes `CassandraDatabaseFeatures.supports_transactions`.
Fixes `CassandraDatabaseFeatures.supports_transactions`.

Should be a property.
slurms/django-cassandra-engine,slurms/django-cassandra-engine,slurms/django-cassandra-engine,r4fek/django-cassandra-engine,paksu/django-cassandra-engine,richardasaurus/django-cassandra-engine,bezineb5/django-cassandra-engine,r4fek/django-cassandra-engine