Commits
- Bug fix with FlyteFile/FlyteDirectory [\436](https://github.com/flyteorg/flytekit/pull/436)
- Spark2 CI [\435](https://github.com/flyteorg/flytekit/pull/435)
- pyproject.toml config and reformat with updated black [\428](https://github.com/flyteorg/flytekit/pull/428)
- Fix serialization of pod specs in pod plugin [\433](https://github.com/flyteorg/flytekit/pull/433)
- Accept auth role arg in single task execution [\432](https://github.com/flyteorg/flytekit/pull/432)
- Lazy load papermill in legacy plugins [\430](https://github.com/flyteorg/flytekit/pull/430)
- Fix map tasks [\429](https://github.com/flyteorg/flytekit/pull/429)