v9.12.1: Merge pull request #1070 from willmcgugan/fixed-9.12.1
[9.12.1] - 2021-02-27
### Fixed
- Fixed deadlock in Progress #1061
Added
- Added Task.finished_speed
Changed
- Froze TransferSpeedColumn speed when task is finished
- Added SIGINT handler to downloader.py example
- Optimization for large tables