[Feature Request]: support ruamel.yaml 0.18+

[Andrew S. Rosen]

Problem

maggma/setup.py

Line 27 in 483962f

 "ruamel.yaml<0.18", 

There is a downward version pin on ruamel.yaml that we should, eventually, address within maggma.

Proposed Solution

TBD.

Alternatives

No response