Bump sphinx-tabs from 2.0.1 to 2.1.0

Bumps [sphinx-tabs](https://github.com/executablebooks/sphinx-tabs) from 2.0.1 to 2.1.0.
- [Release notes](https://github.com/executablebooks/sphinx-tabs/releases)
- [Changelog](https://github.com/executablebooks/sphinx-tabs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/executablebooks/sphinx-tabs/compare/v2.0.1...v2.1.0

)

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