Dvclive

What's Changed
* Keras load model by daavoo in https://github.com/iterative/dvclive/pull/174
* tests: catalyst: make session scope data source by pared in https://github.com/iterative/dvclive/pull/176


**Full Changelog**: https://github.com/iterative/dvclive/compare/0.4.0...0.4.1

💣 Breaking Changes
- Removed public methods (167)

Update from:

python
import dvclive


To:

python
from dvclive import Live

live = Live() or dvclive = Live()

- Added dvclive.set_step (157)
Removed `step` arg from `dvclive.log`
- dvclive.log Refactor (164)
`summary` is generated on each `dvclive.log` call.
- Pytorch Lightning integration (168) Thanks sirily

- Fixed infer next_step for nested metric (155)
- Added release-drafter.yml (158)

- Updated html_path (153)

- Fastai integration (146) . Thanks pacifikus !