Bump html-proofer to 3.7.2
Bump html-proofer to 3.7.2

Bumps [html-proofer](https://github.com/gjtorikian/html-proofer) from 3.5.0 to 3.7.2.
- [Commits](https://github.com/gjtorikian/html-proofer/compare/v3.5.0...v3.7.2)
SomethingNewUK/somethingnewuk.github.io,SomethingNewUK/somethingnewuk.github.io