build: bump public_suffix from 3.1.0 to 3.1.1 in /docs

Bumps [public_suffix](https://github.com/weppos/publicsuffix-ruby) from 3.1.0 to 3.1.1.
- [Release notes](https://github.com/weppos/publicsuffix-ruby/releases)
- [Changelog](https://github.com/weppos/publicsuffix-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/weppos/publicsuffix-ruby/compare/v3.1.0...v3.1.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
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dependabot-preview[bot] 2019-06-25 19:46:27 +00:00 committed by GitHub
parent 3621dadfe2
commit 014c298d45
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@ -221,7 +221,7 @@ GEM
parallel (1.17.0)
pathutil (0.16.2)
forwardable-extended (~> 2.6)
public_suffix (3.1.0)
public_suffix (3.1.1)
rainbow (3.0.0)
rake (12.3.2)
rb-fsevent (0.10.3)