update changelog

Author: RobinMalfait

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - Reintroduce `max-w-screen-*` utilities that read from the `--breakpoint` namespace as deprecated utilities ([#15013](https://github.com/tailwindlabs/tailwindcss/pull/15013))
+- Re-introduce automatic var injection shorthand ([#15020](https://github.com/tailwindlabs/tailwindcss/pull/15020))
 
 ### Fixed