v2.2.1b4

Features

• enable support for get_key_columns and cleanup tests with unknown failures to specific failures. (#721) (1ec0784)
• merge django 2.2 and django 3.2 branches into 1 branch (#717) (bfb2e20)

Bug Fixes

• Bump version number after 2.2.1b3 release (#696) (a8f2aac)

Documentation

• fix changelog link and sample examples. (#700) (08b80ce)
• lint fix for samples (#697) (ed404f5)
• update dbapi location in overview asset file (#702) (4643876)

Miscellaneous Chores

• release 2.2.1b4 (#724) (6581d7b)