Bump html-proofer from 3.7.6 to 3.8.0
Bump html-proofer from 3.7.6 to 3.8.0

Bumps [html-proofer](https://github.com/gjtorikian/html-proofer) from 3.7.6 to 3.8.0.
- [Commits](https://github.com/gjtorikian/html-proofer/compare/v3.7.6...v3.8.0)
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