Update Black Version in .pre-commit-config.yaml (#902)
Update Black Version in .pre-commit-config.yaml (#902)

updates:
- [github.com/psf/black: 21.4b2 → 21.5b1](https://github.com/psf/black/compare/21.4b2...21.5b1)

Co-authored-by: pre-commit-ci[bot] <3ea08453efb076ca910552532a53973a6527df40@users.noreply.github.com>
iModels/mbuild,iModels/mbuild