Bump nokogiri from 1.8.3 to 1.8.4
Bump nokogiri from 1.8.3 to 1.8.4

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.8.3 to 1.8.4.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sparklemotion/nokogiri/compare/v1.8.3...v1.8.4)

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