Bump chrono from 0.4.6 to 0.4.7

[dependabot-preview[bot]]

Bumps chrono from 0.4.6 to 0.4.7.

Changelog

*Sourced from [chrono's changelog](https://github.com/chronotope/chrono/blob/master/CHANGELOG.md).* > ## 0.4.7 > > ### Fixes > > * Disable libc default features so that CI continues to work on rust 1.13 > * Fix panic on negative inputs to timestamp_millis ([@​cmars](https://github.com/cmars) [#292](https://github-redirect.dependabot.com/chronotope/chrono/issues/292)) > * Make `LocalResult` `Copy/Eq/Hash` > > ### Features > > * Add `std::convert::From` conversions between the different timezone formats > ([@​mqudsi](https://github.com/mqudsi) [#271](https://github-redirect.dependabot.com/chronotope/chrono/issues/271)) > * Add `timestamp_nanos` methods ([@​jean](https://github.com/jean)-airoldie [#308](https://github-redirect.dependabot.com/chronotope/chrono/issues/308)) > * Documentation improvements

Commits

- [`d8c68f6`](https://github.com/chronotope/chrono/commit/d8c68f6bd095e3db295d63439f2527f2b74de956) Bump Chrono version to 0.4.7 - [`403af6b`](https://github.com/chronotope/chrono/commit/403af6b29839675b92c9be25d0443cd89220120f) Change README chrono version links to just 0.4 - [`579679b`](https://github.com/chronotope/chrono/commit/579679b9c3afc06929337f522dcb4d9f38dbc7dd) Add changelog entry for 0.4.7 - [`96c451e`](https://github.com/chronotope/chrono/commit/96c451ec20f045eebcfb05dd770bd265cdd01c0e) Merge pull request [#316](https://github-redirect.dependabot.com/chronotope/chrono/issues/316) from GuillaumeGomez/doc-test - [`b700337`](https://github.com/chronotope/chrono/commit/b7003373f2b80072f3bd476b16fd28abc4c2dc54) Add doc-comment to test README examples and fix README examples - [`1407309`](https://github.com/chronotope/chrono/commit/1407309b877b201ff79c016d1d1b1c261c02c386) Merge pull request [#313](https://github-redirect.dependabot.com/chronotope/chrono/issues/313) from kennytm/inline-fixed-offset-getters - [`20a0ab7`](https://github.com/chronotope/chrono/commit/20a0ab7a47f75053b6aeb4b940c8f536a9d70b8a) Mark `FixedOffset::{local_minus_utc, utc_minus_local}` as `#[inline]`. - [`7bc2cd8`](https://github.com/chronotope/chrono/commit/7bc2cd8641373ca398c7745cb55254ee978c7ab2) Merge pull request [#312](https://github-redirect.dependabot.com/chronotope/chrono/issues/312) from kennytm/derive-for-local-result - [`d3dc9c0`](https://github.com/chronotope/chrono/commit/d3dc9c0e10ca07649f983914ff329617898ec5f0) derive {Copy, Eq, Hash} for LocalResult. - [`bcdc66a`](https://github.com/chronotope/chrono/commit/bcdc66a4f8a573f06479e094383ea69edbc223d2) Merge pull request [#271](https://github-redirect.dependabot.com/chronotope/chrono/issues/271) from mqudsi/offset_convert - Additional commits viewable in [compare view](https://github.com/chronotope/chrono/compare/v0.4.6...v0.4.7)

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[dependabot-preview[bot]]

Looks like chrono is up-to-date now, so this is no longer needed.