Bump bytes from 0.5.4 to 0.5.5 (#216)

Bumps [bytes](https://github.com/tokio-rs/bytes) from 0.5.4 to 0.5.5.
- [Release notes](https://github.com/tokio-rs/bytes/releases)
- [Changelog](https://github.com/tokio-rs/bytes/blob/master/CHANGELOG.md)
- [Commits](tokio-rs/bytes@v0.5.4...v0.5.5)

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