It would fail to perform the replacement, but unfortunately wouldn't
stop the release process.

The latter could be done, but isn't implemented either as it's hard
to test given everything is runtime.

That way people who use it won't be deterred, while it unifies style
everywhere.

flake8 fix

format path ->  os.path in prep for pathlib

Import README.md

Comment out python 3.10 for next release