Bump criterion from 0.3.3 to 0.3.4

Bumps [criterion](https://github.com/bheisler/criterion.rs) from 0.3.3 to 0.3.4.
- [Release notes](https://github.com/bheisler/criterion.rs/releases)
- [Changelog](https://github.com/bheisler/criterion.rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/bheisler/criterion.rs/commits)

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