[DRAFT] release: 2.20.0 changelog

[david-allison]

@mikehardy FYI

Links:

* Your https://opencollective.com/ankidroid#category-CONTRIBUTE[donations] 
* https://apilevels.com/[Android 6 (2015)]
* https://crowdin.com/project/ankidroid[New community-provided language translations]
* https://github.com/ankidroid/Anki-Android/milestone/64?closed=1[Full changelog]

• https://opencollective.com/ankidroid#category-CONTRIBUTE Updated to: https://opencollective.com/ankidroid/contribute
  • This is modified from last release to move to the correct section
  • Anki-Android uses: https://opencollective.com/ankidroid/contribute which may be better than this
• https://apilevels.com/
• https://crowdin.com/project/ankidroid
• https://github.com/ankidroid/Anki-Android/milestone/64?closed=1

[david-allison]

I think we could move this around

[mikehardy]

it is time