Add a release note about the AU-to-au change
Add a release note about the AU-to-au change

exoanalytic/python-skyfield,skyfielders/python-skyfield,skyfielders/python-skyfield,ozialien/python-skyfield,GuidoBR/python-skyfield,ozialien/python-skyfield,GuidoBR/python-skyfield,exoanalytic/python-skyfield