Increasing umami version to 0.6
The following new features were added since release 0.5:
- CI improvements
- latest samples added to documentation
- packages were upgraded
- new Python API added for plotting of ROC curves
- Added normalisation option to input plotting
- logging level for all tests are set by default to debug
- Added optional results filename extension
- Added docs for pdf method and parallelise pdf method
- Possibility to modify names of track variables in config files
- Added new sphinx documentation
- Black was added in CI
- fraction contour plots were added
- bb-jets category colour was changed
- Copying now config files during pre-processing
- several doc string updates
- docs update for taggers (merged them)
- save divide added
- flexible validation sample definition in config added