Consider using setuptools-scm instead of versioneer

[djhoese]

Versioneer is no longer maintained. It was brought up on pydata/xarray#2853 that setuptools-scm may be a good alternative and it looks like it has recent releases.

https://pypi.org/project/setuptools-scm/

[mraspaud]

Thanks for bringing this up @djhoese. Indeed if versioneer isn't maintained, we'll have to move away from it.