core: prepare to release 0.1.21 (tokio-rs#1610)

# 0.1.21 (October 1, 2021)

This release adds support for recording `Option<T> where T: Value` as
typed `tracing` field values.

### Added

- **field**: `Value` impl for `Option<T> where T: Value` ([tokio-rs#1585])

### Fixed

- Fixed deprecation warnings when building with `default-features`
  disabled ([tokio-rs#1603], [tokio-rs#1606])
- Documentation fixes and improvements ([tokio-rs#1595], [tokio-rs#1601])

Thanks to @BrianBurgers, @DCjanus, and @matklad for contributing to this
release!

[tokio-rs#1585]: tokio-rs#1585
[tokio-rs#1595]: tokio-rs#1595
[tokio-rs#1601]: tokio-rs#1601
[tokio-rs#1603]: tokio-rs#1603
[tokio-rs#1606]: tokio-rs#1606

Author: hawkw

tracing-core/CHANGELOG.md

@@ -1,3 +1,27 @@
+# 0.1.21 (October 1, 2021)
+
+This release adds support for recording `Option<T> where T: Value` as typed
+`tracing` field values.
+
+### Added
+
+- **field**: `Value` impl for `Option<T> where T: Value` ([#1585])
+
+### Fixed
+
+- Fixed deprecation warnings when building with `default-features` disabled
+  ([#1603], [#1606])
+- Documentation fixes and improvements ([#1595], [#1601])
+
+Thanks to @brianburgers, @DCjanus, and @matklad for contributing to this
+release!
+
+[#1585]: https://github.com/tokio-rs/tracing/pull/1585
+[#1595]: https://github.com/tokio-rs/tracing/pull/1595
+[#1601]: https://github.com/tokio-rs/tracing/pull/1601
+[#1603]: https://github.com/tokio-rs/tracing/pull/1603
+[#1606]: https://github.com/tokio-rs/tracing/pull/1606
+
 # 0.1.20 (September 12, 2021)
 
 This release adds support for `f64` as one of the `tracing-core`

tracing-core/README.md

@@ -16,9 +16,9 @@ Core primitives for application-level tracing.
 [Documentation][docs-url] | [Chat][discord-url]
 
 [crates-badge]: https://img.shields.io/crates/v/tracing-core.svg
-[crates-url]: https://crates.io/crates/tracing-core/0.1.20
+[crates-url]: https://crates.io/crates/tracing-core/0.1.21
 [docs-badge]: https://docs.rs/tracing-core/badge.svg
-[docs-url]: https://docs.rs/tracing-core/0.1.20
+[docs-url]: https://docs.rs/tracing-core/0.1.21
 [docs-master-badge]: https://img.shields.io/badge/docs-master-blue
 [docs-master-url]: https://tracing-rs.netlify.com/tracing_core
 [mit-badge]: https://img.shields.io/badge/license-MIT-blue.svg
@@ -79,7 +79,7 @@ The following crate feature flags are available:
 
   ```toml
   [dependencies]
-  tracing-core = { version = "0.1.20", default-features = false }
+  tracing-core = { version = "0.1.21", default-features = false }
   ```
 
   **Note**:`tracing-core`'s `no_std` support requires `liballoc`.