Bump i18n from 1.8.7 to 1.8.9 (#269)

Bumps [i18n](https://github.com/ruby-i18n/i18n) from 1.8.7 to 1.8.9.
- [Release notes](https://github.com/ruby-i18n/i18n/releases)
- [Changelog](https://github.com/ruby-i18n/i18n/blob/master/CHANGELOG.md)
- [Commits](ruby-i18n/i18n@v1.8.7...v1.8.9)

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