Taskkit

What's Changed
* fixed return value of Scheduler.__call__ by saryou in https://github.com/saryou/taskkit/pull/6


**Full Changelog**: https://github.com/saryou/taskkit/compare/0.1.6...0.1.7

What's Changed
* support python 3.9 by saryou in https://github.com/saryou/taskkit/pull/5


**Full Changelog**: https://github.com/saryou/taskkit/compare/0.1.5...0.1.6

What's Changed
* fix DjangoBackend.assign_task that potentially assigning a task to mu… by saryou in https://github.com/saryou/taskkit/pull/4


**Full Changelog**: https://github.com/saryou/taskkit/compare/0.1.4...0.1.5

What's Changed
* Feature/improve interfaces by saryou in https://github.com/saryou/taskkit/pull/2
* rename Controller to EventBridge by saryou in https://github.com/saryou/taskkit/pull/3


**Full Changelog**: https://github.com/saryou/taskkit/compare/0.1.3...0.1.4

**Full Changelog**: https://github.com/saryou/taskkit/compare/0.1.2...0.1.3

**Full Changelog**: https://github.com/saryou/taskkit/compare/0.1.1...0.1.2