Bump chrono from 0.4.37 to 0.4.38

[dependabot]

Bumps chrono from 0.4.37 to 0.4.38.

Release notes

Sourced from chrono's releases.

v0.4.38

This release bring a ca. 20% improvement to the performance of the formatting code, and a convenient days_since method for the Weekday type.

Chrono 0.4.38 also removes the long deprecated rustc-serialize feature. Support for rustc-serialize will be soft-destabilized in the next Rust edition. Removing the feature will not break existing users of the feature; Cargo will just not update dependents that rely on it to newer versions of chrono.

In chrono 0.4.36 we made an accidental breaking change by switching to derive(Copy) for DateTime instead of a manual implementation. It is reverted in this release.

Removals

• Remove rustc-serialize feature (#1548, thanks @​workingjubilee)

Additions

• Add Weekday::days_since (#1249, based on #216 by @​clarfonthey)
• Add TimeDelta::checked_mul and TimeDelta::checked_div (#1565, thanks @​Zomtir)

Fixes

• Return error when rounding with a zero duration (#1474, thanks @​Dav1dde)
• Manually implement Copy for DateTime if offset is Copy (#1573)

Internal

• Inline test_encodable_json and test_decodable_json functions (#1550)
• CI: Reduce combinations in cargo hack check (#1553)
• Refactor formatting code (#1335)
• Optimize number formatting (#1558)
• Only package files needed for building and testing (#1554)

Thanks to all contributors on behalf of the chrono team, @​djc and @​pitdicker!

Commits

• 352a352 Prepare 0.4.38
• 46d44d6 Manually implement Copy for DateTime if offset is Copy
• 760eb66 Update windows-bindgen requirement from 0.55 to 0.56
• 391187f Return error when rounding with zero duration
• ffc75e5 Add TimeDelta::checked_mul and TimeDelta::checked_div
• f8cecbe Make Weekday::num_days_from public, rename to days_since.
• 0cfc405 Optimize number formatting
• 74ba83b Take pad by value
• 78e79db Match on tuples in format_fixed
• f3d76c7 Match on tuples in format_numeric
• Additional commits viewable in compare view

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