build: bump html-proofer from 3.15.0 to 3.15.1 in /docs

Bumps [html-proofer](https://github.com/gjtorikian/html-proofer) from 3.15.0 to 3.15.1.
- [Release notes](https://github.com/gjtorikian/html-proofer/releases)
- [Commits](https://github.com/gjtorikian/html-proofer/compare/v3.15.0...v3.15.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
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dependabot-preview[bot] 2020-01-20 18:41:45 +00:00 committed by GitHub
parent d014d5a982
commit fe9ce42949
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@ -83,7 +83,7 @@ GEM
html-pipeline (2.12.3)
activesupport (>= 2)
nokogiri (>= 1.4)
html-proofer (3.15.0)
html-proofer (3.15.1)
addressable (~> 2.3)
mercenary (~> 0.3)
nokogumbo (~> 2.0)