Bump underscore.string from 3.3.4 to 3.3.5

Bumps [underscore.string](https://github.com/epeli/underscore.string) from 3.3.4 to 3.3.5.
- [Release notes](https://github.com/epeli/underscore.string/releases)
- [Changelog](https://github.com/esamattis/underscore.string/blob/master/CHANGELOG.markdown)
- [Commits](https://github.com/epeli/underscore.string/compare/3.3.4...3.3.5

)

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