New release since we haven't had a release in a long time

Amongst other things, contains fixes for:

• [52bc3b0] XSS select dropdown rendering
• [4f817d6] Handle nulls better
• [8b3a681] Regression fixes
• [64fe31c] Don't duplicate jQuery imports
• [f299de9] Flake8
• [b58f7ae] Using horizontal widget in admin

Additionally, we will now attempt to have every future release on both GitHub and PyPI.

Thanks to:

• Maciej "RooTer" Urbański
• Jim Kutter
• savoirfairelinux
• jorgecorrea

Special thanks to:

• Jakub Szafrański