Bump chrono from 0.4.4 to 0.4.5

Bumps [chrono](https://github.com/chronotope/chrono) from 0.4.4 to 0.4.5.
- [Release notes](https://github.com/chronotope/chrono/releases)
- [Changelog](https://github.com/chronotope/chrono/blob/master/CHANGELOG.md)
- [Commits](https://github.com/chronotope/chrono/compare/v0.4.4...v0.4.5

)

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