This release adds support for publishing wheels to PyPi for Python 3.9. Wheel building is currently broken for Python 3.9 on Arm/Aarch64.
This release also drops building of wheels for Python 3.5.
This required some significant changes to the Travis and Appveyor configurations including:
- Moving to Visual Studio 2019 (14.2) on AppVeyor
- Building against the XCode 12.2 image on Travis