Vendor dependencies for 0.3.0 release

vendor/tracing-subscriber/README.md

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+![Tracing — Structured, application-level diagnostics][splash]
+
+[splash]: https://raw.githubusercontent.com/tokio-rs/tracing/main/assets/splash.svg
+
+# tracing-subscriber
+
+Utilities for implementing and composing [`tracing`][tracing] subscribers.
+
+[`tracing`] is a framework for instrumenting Rust programs to collect
+scoped, structured, and async-aware diagnostics. The `Subscriber` trait
+represents the functionality necessary to collect this trace data. This
+crate contains tools for composing subscribers out of smaller units of
+behaviour, and batteries-included implementations of common subscriber
+functionality.
+
+`tracing-subscriber` is intended for use by both `Subscriber` authors and
+application authors using `tracing` to instrument their applications.
+
+[![Crates.io][crates-badge]][crates-url]
+[![Documentation][docs-badge]][docs-url]
+[![Documentation (v0.2.x)][docs-v0.2.x-badge]][docs-v0.2.x-url]
+[![MIT licensed][mit-badge]][mit-url]
+[![Build Status][actions-badge]][actions-url]
+[![Discord chat][discord-badge]][discord-url]
+![maintenance status][maint-badge]
+
+[Documentation][docs-url] | [Chat][discord-url]
+
+[tracing]: https://github.com/tokio-rs/tracing/tree/main/tracing
+[tracing-fmt]: https://github.com/tokio-rs/tracing/tree/main/tracing-subscriber
+[crates-badge]: https://img.shields.io/crates/v/tracing-subscriber.svg
+[crates-url]: https://crates.io/crates/tracing-subscriber
+[docs-badge]: https://docs.rs/tracing-subscriber/badge.svg
+[docs-url]: https://docs.rs/tracing-subscriber/latest
+[docs-v0.2.x-badge]: https://img.shields.io/badge/docs-v0.2.x-blue
+[docs-v0.2.x-url]: https://tracing.rs/tracing_subscriber
+[mit-badge]: https://img.shields.io/badge/license-MIT-blue.svg
+[mit-url]: LICENSE
+[actions-badge]: https://github.com/tokio-rs/tracing/workflows/CI/badge.svg
+[actions-url]:https://github.com/tokio-rs/tracing/actions?query=workflow%3ACI
+[discord-badge]: https://img.shields.io/discord/500028886025895936?logo=discord&label=discord&logoColor=white
+[discord-url]: https://discord.gg/EeF3cQw
+[maint-badge]: https://img.shields.io/badge/maintenance-experimental-blue.svg
+
+*Compiler support: [requires `rustc` 1.65+][msrv]*
+
+[msrv]: #supported-rust-versions
+
+## Supported Rust Versions
+
+Tracing is built against the latest stable release. The minimum supported
+version is 1.65. The current Tracing version is not guaranteed to build on Rust
+versions earlier than the minimum supported version.
+
+Tracing follows the same compiler support policies as the rest of the Tokio
+project. The current stable Rust compiler and the three most recent minor
+versions before it will always be supported. For example, if the current stable
+compiler version is 1.69, the minimum supported version will not be increased
+past 1.66, three minor versions prior. Increasing the minimum supported compiler
+version is not considered a semver breaking change as long as doing so complies
+with this policy.
+
+## License
+
+This project is licensed under the [MIT license](LICENSE).
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in Tracing by you, shall be licensed as MIT, without any additional
+terms or conditions.