tracing: prepare to release 0.1.28 (tokio-rs#1577)

# 0.1.28 (September 17th, 2021)

This release fixes an issue where the RustDoc documentation was rendered
incorrectly. It doesn't include any actual code changes, and is very
boring and can be ignored.

### Fixed

- **docs**: Incorrect documentation rendering due to unclosed `<div>`
  tag ([tokio-rs#1572])

[tokio-rs#1572]: tokio-rs#1572

tracing/CHANGELOG.md

@@ -1,3 +1,16 @@
+# 0.1.28 (September 17th, 2021)
+
+This release fixes an issue where the RustDoc documentation was rendered
+incorrectly. It doesn't include any actual code changes, and is very boring and
+can be ignored.
+
+### Fixed
+
+- **docs**: Incorrect documentation rendering due to unclosed `<div>` tag
+  ([#1572])
+
+[#1572]: https://github.com/tokio-rs/tracing/pull/1572
+
 # 0.1.27 (September 13, 2021)
 
 This release adds a new [`Span::or_current`] method to aid in efficiently

tracing/README.md

@@ -250,7 +250,7 @@ my_future
 is as long as the future's.
 
 The second, and preferred, option is through the
-[`#[instrument]`](https://docs.rs/tracing/0.1.27/tracing/attr.instrument.html)
+[`#[instrument]`](https://docs.rs/tracing/0.1.28/tracing/attr.instrument.html)
 attribute:
 
 ```rust
@@ -297,7 +297,7 @@ span.in_scope(|| {
 // Dropping the span will close it, indicating that it has ended.
 ```
 
-The [`#[instrument]`](https://docs.rs/tracing/0.1.27/tracing/attr.instrument.html) attribute macro
+The [`#[instrument]`](https://docs.rs/tracing/0.1.28/tracing/attr.instrument.html) attribute macro
 can reduce some of this boilerplate:
 
 ```rust