Bump sinon-chai from 3.5.0 to 3.6.0

Bumps [sinon-chai](https://github.com/domenic/sinon-chai) from 3.5.0 to 3.6.0.
- [Release notes](https://github.com/domenic/sinon-chai/releases)
- [Changelog](https://github.com/domenic/sinon-chai/blob/master/CHANGELOG.md)
- [Commits](https://github.com/domenic/sinon-chai/compare/3.5.0...3.6.0

)

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