Ploomber

- Support for R
- Adding section on R pipeline to the documentation
- Construct pipeline from a directory (no need to write a
`pipeline.yaml` file)
- Improved error messages when DAG fails to initialize (jupyter
notebook app)
- Bug fixes
- CLI accepts factory function parameters as positional arguments,
types are inferred using type hints, displayed when calling `--help`
- CLI accepts env variables (if any), displayed when calling `--help`

- Simplified CLI (breaking changes)
- Refactors internal API for notebook conversion, adds tests for
common formats
- Metadata is deleted when saving a script from the Jupyter notebook
app to make sure the task runs in the next pipeline build
- SQLAlchemyClient now supports custom tokens to split source

- Adding `--log` option to CLI commands
- Fixes a bug that caused the `dag` variable not to be
exposed during interactive sessions
- Fixes `ploomber task` forced run
- Adds SQL pipeline tutorial to get started docs
- Minor CSS changes to docs

- Support for `env.yaml` in `pipeline.yaml`
- Improved CLI. Adds `plot`, `report` and `task` commands`

- Changes `pipeline.yaml` default (extract_product: True)
- Documentation re-design
- Simplified `ploomber new` generated files
- Ability to define `product` in SQL scripts
- Products are resolved to absolute paths to avoid ambiguity
- Bug fixes

- Adds Jupyter notebook extension to inject parameters when opening a
task
- Improved CLI `ploomber new`, `ploomber add` and `ploomber entry`
- Spec API documentation additions
- Support for `on_finish`, `on_failure` and `on_render` hooks in spec API
- Improved validation for DAG specs
- Several bug fixes