Update Rust crate chrono to v0.4.20

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
chrono	dependencies	patch	=0.4.19 -> =0.4.20

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Release Notes

chronotope/chrono

v0.4.20

Compare Source

• Add more formatting documentation and examples.
• Add support for microseconds timestamps serde serialization/deserialization (#​304)
• Fix DurationRound is not TZ aware (#​495)
• Implement DurationRound for NaiveDateTime
• Implement std::iter::Sum for Duration
• Add DateTime::from_local() to construct from given local date and time (#​572)
• Add a function that calculates the number of years elapsed between now and a given Date or DateTime (#​557)
• Correct build for wasm32-unknown-emscripten target (#​568)
• Change Local::now() and Utc::now() documentation from "current date" to "current date and time" (#​647)
• Fix duration_round panic on rounding by Duration::zero() (#​658)
• Add optional rkyv support.
• Add support for microseconds timestamps serde serialization for NaiveDateTime.
• Add support for optional timestamps serde serialization for NaiveDateTime.
• Fix build for wasm32-unknown-emscripten (@​yu-re-ka #​593)
• Make ParseErrorKind public and available through ParseError::kind() (#​588)
• Implement DoubleEndedIterator for NaiveDateDaysIterator and NaiveDateWeeksIterator
• Fix panicking when parsing a DateTime (@​botahamec)
• Add support for getting week bounds based on a specific NaiveDate and a Weekday (#​666)
• Remove libc dependency from Cargo.toml.
• Add the and_local_timezone method to NaiveDateTime
• Fix the behavior of Duration::abs() for negative durations with non-zero nanos
• Add compatibility with rfc2822 comments (#​733)
• Make js-sys and wasm-bindgen enabled by default when target is wasm32-unknown-unknown for ease of API discovery
• Add the Months struct and associated Add and Sub impls

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