Bump sinon from 5.0.10 to 6.0.0

Bumps [sinon](https://github.com/sinonjs/sinon) from 5.0.10 to 6.0.0.
- [Release notes](https://github.com/sinonjs/sinon/releases)
- [Changelog](https://github.com/sinonjs/sinon/blob/master/docs/changelog.md)
- [Commits](https://github.com/sinonjs/sinon/commits

)

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