run tests on Django 2.2

[tisdall]

No description provided.

[coveralls]

Coverage remained the same at 83.882% when pulling 9e8795f on tisdall:update_tox into b8aaa47 on mwarkentin:master.

[tisdall]

It seems PyMySQL has issues with Django 2.2 and isn't supported.

[tisdall]

If I change the 'requirements-test.txt' to use mysqlclient>=1.3.13 it should solve the issue. However, it seems PyMySQL was chosen for a reason (from the notes in the file). From what I've read, it doesn't look like there's a way to get PyMySQL to work with Django 2.2 (due to it switching to using bytes instead of str).

Here's the exception on the failed check:
django.core.exceptions.ImproperlyConfigured: mysqlclient 1.3.13 or newer is required; you have 0.9.3.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[mwarkentin]

According to PyMySQL/PyMySQL#790 (comment) this should be fixed for Django 3.0, although I wasn't able to figure out what fix he was actually referring to.

[tisdall]

Travis seems to have support for the C libraries needed for mysqlclient so I switched it over to use it and now the tests pass. Django 2.2 specifically says to use mysqlclient and I don't think things are going to be fixed in PyMySQL to support Django 2.2 (which is a LTS version).

[mwarkentin]

LGTM, thanks!