Version 0.21.6 Commits [46d83aa] Fix MPRester import in core client (#567) [32c45ba] Update README.md [64c229b] Fix electrode test [6785935] Update reqs [77f4af7] Bump maggma from 0.40.0 to 0.44.1 (#551) [e08de40] Bump emmet-core from 0.21.19 to 0.21.20 (#540) [d1a79a5] Add back windows testing