Old demo 7

[trexfeathers]

trexfeathers/cf-units#4 (by @trexfeathers) includes changes to .pre-commit-config.yaml. This file is templated by templates/.pre-commit-config.yaml. Please either:

• Action this issue with a pull request applying the changes to templates/.pre-commit-config.yaml.
• Close this issue if the changes are not suitable for templating.