Skippa

- Cleanup/fix in examples/full-pipeline.py

- Added `.apply()` transformer for `pandas.DataFrame.apply()` functionality
- Documentation and examples update

- Added `.assign()` transformer for `pandas.DataFrame.assign()` functionality
- Added `.cast()` transformer (with aliases `.astype()` & `.as_type()`) for `pandas.DataFrame.astype` functionality

- Fixes and documentation.

- First release on PyPI.