- Drop Python 3.6 support - Add Python 3.9 support - Require Graphviz 2.42+, (Graphviz 2.46+ recommended) - Improve installation process and documentation - Switch from nose to pytest - Remove old Python 2 code - AGraph.eq includes attribute comparison (PR #246) OBS-URL: https://build.opensuse.org/package/show/devel:languages:python/python-pygraphviz?expand=0&rev=18