Update tracing-subscriber requirement from 0.2.18 to 0.3.8

[dependabot]

Updates the requirements on tracing-subscriber to permit the latest version.

Release notes

Sourced from tracing-subscriber's releases.

tracing-subscriber 0.3.8

This release adds experimental support for recording structured field values using the valuable crate to the format::Json formatter. In particular, user-defined types which are recorded using their valuable::Valuable implementations will be serialized as JSON objects, rather than using their fmt::Debug representation. See this blog post for details on valuable.

Note that valuable support currently requires --cfg tracing_unstable. See the documentation for details.

Additionally, this release includes a number of other smaller API improvements.

Added

• json: Experimental support for recording valuable values as structured JSON (#1862, #1901)
• filter: Targets::would_enable method for testing if a Targets filter would enable a given target (#1903)
• fmt: map_event_format, map_fmt_fields, and map_writer methods to fmt::Layer and fmt::SubscriberBuilder (#1871)

Changed

• tracing-core: updated to 0.1.22

Fixed

• Set smallvec minimal version to 1.2.0, to fix compilation errors with -Z minimal-versions (#1890)
• Minor documentation fixes (#1902, #1893)

Thanks to @​guswynn, @​glts, and @​lilyball for contributing to this release!

#1862: tokio-rs/tracing#1862 #1901: tokio-rs/tracing#1901 #1903: tokio-rs/tracing#1903 #1871: tokio-rs/tracing#1871 #1890: tokio-rs/tracing#1890 #1902: tokio-rs/tracing#1902 #1893: tokio-rs/tracing#1893

Commits

• b37220c subscriber: prepare to release v0.3.8 (#1905)
• c661c23 serde: prepare to release 0.1.3 (#1904)
• b411a5c subscriber: add Targets::would_enable (#1903
• 4b2903f subscriber: fix broken docs links (#1902)
• 31df8cd docs: document tracing-subscriber valuable support (#1901)
• df4ba17 tracing: prepare to release 0.1.30 (#1899)
• 46eda1e attributes: prepare to release 0.1.19
• 0f8326b core: prepare to release v0.1.22 (#1897)
• 789257e ci: unbreak check-features
• 0f17e76 subscriber: fix outdated formatter docs (#1893)
• Additional commits viewable in compare view

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[dependabot]

Superseded by #66.