Update redis requirement from 0.7.0 to 0.10.0
Update redis requirement from 0.7.0 to 0.10.0

Updates the requirements on [redis](https://github.com/mitsuhiko/redis-rs) to permit the latest version.
- [Release notes](https://github.com/mitsuhiko/redis-rs/releases)
- [Changelog](https://github.com/mitsuhiko/redis-rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mitsuhiko/redis-rs/compare/0.7.0...0.10.0)
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