update changelog

Author: RobinMalfait

CHANGELOG.md

@@ -47,6 +47,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Add `mix-blend-plus-lighter` utility ([#8288](https://github.com/tailwindlabs/tailwindcss/pull/8288))
 - Add arbitrary variants ([#8299](https://github.com/tailwindlabs/tailwindcss/pull/8299))
 - Add `matchVariant` API ([#8310](https://github.com/tailwindlabs/tailwindcss/pull/8310))
+- Implement variant grouping ([#8405](https://github.com/tailwindlabs/tailwindcss/pull/8405))
 
 ## [3.0.24] - 2022-04-12