This is a bugfix and enhancement release. The principal evolutions are:
- Fixed flat_map with mapper returning an asyncio Future #457
- Fixed await on Observable that schedules later #456
- Fixed scheduler forwading in several operators #476 #492 #493
- Fixed concat: subscribe scheduler not forwarded + sources iterable exhaustion #486
- Fixed missing default scheduler in timer operator #481
- Fixed concat_with_iterable: subscribe scheduler is not forwarded #495
- Added subject mapper to group_by and group_by_until #467
- Many small fixes on the documentation