Scikit-posthocs

This release includes a number of updates:
* argument `method` was added to [`posthoc_wilcoxon`](https://scikit-posthocs.readthedocs.io/en/latest/generated/scikit_posthocs.posthoc_wilcoxon.html) method (#67), restricted SciPy version, and dropped support for Python 3.7 and 3.8
* [Dunnett's test](https://scikit-posthocs.readthedocs.io/en/latest/generated/scikit_posthocs.posthoc_dunnett.html) for multiple comparisons against a control group (used after parametric ANOVA) was added by EricHUANG970823

This release fixes Conover's post hoc test for unreplicated blocked data (63, thanks to liborak).

This release includes a number of features, enhancements and fixes:
* critical difference diagrams (see [`critical_difference_diagram`](https://scikit-posthocs.readthedocs.io/en/latest/generated/scikit_posthocs.critical_difference_diagram.html)) are implemented (thanks to pedroilidio and chengmingbo)
* `outliers_gesd` code improved (thanks to ysBach)
* increased abs tolerance for wilcoxon test (`test_posthoc_wilcoxon`)
* minor updates and fixes

This release adds type hints to all package functions and fixes a bug in heatmap plotting (https://github.com/maximtrp/scikit-posthocs/issues/51).

This release fixes the issue with block data conversion when pandas DataFrame was passed with `melted = True` argument and non-default columns names (other than `y`, `groups`, and `blocks`).

This is a stable release of scikit-posthocs package (v0.6.6).