What's Changed
* bugfix: output_paths type is wrong by kitagry in https://github.com/m3dev/gokart/pull/366
* add type aware flatten method instead of `luigi.task.flatten` by kitagry in https://github.com/m3dev/gokart/pull/362
* Bump idna from 3.6 to 3.7 by dependabot in https://github.com/m3dev/gokart/pull/367
* remove debug print by mski-iksm in https://github.com/m3dev/gokart/pull/369
* Use `dill` instead of `pickle` for processing `.pkl` files by maronuu in https://github.com/m3dev/gokart/pull/354
**Full Changelog**: https://github.com/m3dev/gokart/compare/1.2.9...1.3.0