This PR updates the test matrix for the currently maintained versions of Django (1.11, 2.1 and 2.2), along with the currently maintained versions of Python that they support (2.7, 3.5, 3.6, 3.7). Tests have been added for more recent versions of Celery and a test updated as a return type was changed in Celery 4.3.
This PR updates the test matrix for the currently maintained versions of Django (1.11, 2.1 and 2.2), along with the currently maintained versions of Python that they support (2.7, 3.5, 3.6, 3.7). Tests have been added for more recent versions of Celery and a test updated as a return type was changed in Celery 4.3.