This is basically identical to #610, but for a newer Django version.

Django recently bumped the required mysqlclient version to 1.3.13 (django/django@88619e6), but pymysql's version string only says it's only compatible with 1.3.12 (#623)

Any way we can get at least 1.3.13 support? Like the reporter of that other issue, I don't really know the implications of this change, and I can just make mysqlclient work in the interm, but I do prefer pymysql for ease of use on mac. Thanks so much for all your work supporting this library! :)