build(deps-dev): bump html-proofer from 3.18.5 to 3.18.6 in /docs

Bumps [html-proofer](https://github.com/gjtorikian/html-proofer) from 3.18.5 to 3.18.6.
- [Release notes](https://github.com/gjtorikian/html-proofer/releases)
- [Commits](https://github.com/gjtorikian/html-proofer/compare/v3.18.5...v3.18.6)

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dependabot[bot] 2021-02-22 05:34:06 +00:00 committed by GitHub
parent cdaf5cca16
commit b280741ae1
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@ -87,7 +87,7 @@ GEM
html-pipeline (2.14.0)
activesupport (>= 2)
nokogiri (>= 1.4)
html-proofer (3.18.5)
html-proofer (3.18.6)
addressable (~> 2.3)
mercenary (~> 0.3)
nokogumbo (~> 2.0)