Highlights of this release

This is a bugfix release that fixes an issue that was causing memory
corruption and occasional segfaults when using the new ArrayImage and
PILImage classes on Windows with PySide2.

Detailed changes

Thanks to:

• Mark Dickinson
• Rahul Poruri
• Corran Webster
• John Wiggins

Fixes

• fix segfaults and memory corruption from dropped QImage references (#1108)