Update changelog

Author: reinink

Diff for: CHANGELOG.md

@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+- Add `prose-kbd` modifier ([#340](https://github.com/tailwindlabs/tailwindcss-typography/pull/340))
 - Fix space between `<figcaption>` and `<video>` ([#339](https://github.com/tailwindlabs/tailwindcss-typography/pull/339))
 
 ## [0.5.10] - 2023-09-05