Bumps [faker](https://github.com/faker-ruby/faker) from 2.17.0 to 2.18.0.
- [Release notes](https://github.com/faker-ruby/faker/releases)
- [Changelog](https://github.com/faker-ruby/faker/blob/master/CHANGELOG.md)
- [Commits](https://github.com/faker-ruby/faker/compare/v2.17.0...v2.18.0

)

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