What's Changed
* feat: add BOOLEAN feature type by vassilismin in https://github.com/ntua-unit-of-control-and-informatics/jaqpotpy/pull/136
* fix: take a copy from x_cols list by vassilismin in https://github.com/ntua-unit-of-control-and-informatics/jaqpotpy/pull/135
**Full Changelog**: https://github.com/ntua-unit-of-control-and-informatics/jaqpotpy/compare/6.19.0...6.19.1