obonet v0.3.0 release

Commits

0ce7c81 notebook example for replacing obsolete terms
c93e0fc Address duplicate name/ontology key error
90d7fab tests: update missing name behavior
2d1ea87 packaging: setup.cfg, pyproject.toml, setuptools_scm
4e4585c pre-commit checks
bca4a71 readme: developing docs
d616ac3 CI: github actions build
a53b4e9 CI: github actions release
c5c614c CI: remove travis
39a1cee update readme badges
04f81e1 ci: don't fail fast
f48bc0d rename default branch to main
ece5a93 readme: commands to generate release notes