-------------------
Added
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* Extensive new validation using numerous flake8 plugins (including black for code style and pydocstyle for docstrings, among others).
Changed
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* Drop support for all Python versions earlier than 3.6 and all NumPy versions before 1.15.
Fixed
+++++
* Docstring of geometry.angle was missing a factor of 2 in the comparison to intrinsic_distance.
* Docstrings of functions using support1d decorator were losing their docstring (fixed with functools.wraps).
* Docstrings of return types of all functions.