holoviz/hvplot: Version 0.7.2

This is a minor release with a number of bug fixes and enhancements. Many thanks to @StefanBrand, @loicduffar, @brl0, @michaelaye, @aaronspring, @toddrjen, @raybellwaves, @jlstevens, @jbednar and @philippjfr for contributing. Features: Add support for geographic features (#622) Added support for OHLC plot (#623) Enhancements: Support setting options for diagonal plots in scatter_matrix (#602) Take group_label from columns if available (#615) Add kwargs to interactive.layout() Bug fixes: Fix support for clim on contours (#587) Adding default coordinates to datasets with missing coords (#605) Do not plot streamz example point (#614) Fix passing in multiple z-values (#616) Ensure violin and boxplot color is applied (#619) Ensure categorical colormapping is applied during datashade (#621) Compatibility: Switch default tile source to OSM (since Wikipedia tiles are no longer available) (#610) Documentation: Correctly document .hist rather than .histogram (#571) Use strings rather than bytes when referring to airplane dataset columns (#538) Preserve function signature and docstring in with_hv_extension (#601) Add hover_cols example (#612) Switch to pydata sphinx theme (#613) Update available options in customization docs (#620