test_relationships_loadonly is failing

The test_relationships_loadonly is currently failing due to a change in SQLAlchemy, starting in 1.1.14.

The load_only join modifier (as of 1.1.14) will add the primary key of the related model, even if it's not part of the load_only argument list.

See list discussion: https://groups.google.com/forum/#!topic/sqlalchemy/oIdEACIQSJ4

This issue is mainly a reminder to me to test it periodically.