Bump year

Merge branch 'master' into 0.8.X

# Conflicts:
#	upsetplot/__init__.py

For 0.8.1

Release 0.8.0

Fix flake

Release 0.6.1

Release 0.6.0

Version 0.5.0

DOC/CI add nbsphinx to doc requirements

Merge branch '0.4.X' into release0.4.4