3.2.0

Ellipsoid: canonical default instead of None

update version string

require Python >= 3.8

Numpy NEP29 dropped support for Python < 3.8 in December 2021.
We are having a harder time supporting corner cases in Python 3.7.

ci: across os in case of numeric diffs

test float32 geodetic2ecef

math.tau for clarity

lox: tolerate array / scalar together better