This release fixes some upgrade issues that can occur with very old

databases, due to differences in how unique_together state was

serialized and compared, and due to attempting to apply evolutions to

newly-added models.
There's also a patch for ensuring compatibility between Django <= 1.11

and mysqlclient >= 2.1 on Python 3.

Built the release notes. Checked for spelling errors, build errors, and

link errors.