Prep for 5.0.13 release

Update release notes and version for 5.0.12

Update release notes and version for 5.0.11

Update release notes and version for 5.0.10

 5.0.10

Update release notes and version for 5.0.9 release

Prepare for 5.0.8 release

Prepare for 5.0.7 release

Merge pull request #88 from cfpb/django40-python39

Add Django 4.0 support and update to test against Python 3.9

Update releasenotes.md

Prep for 5.0.4 release