Update changelog

Author: thecrypticace

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Add `line-height` modifier support to `font-size` utilities ([#9875](https://github.com/tailwindlabs/tailwindcss/pull/9875))
 - Support using variables as arbitrary values without `var(...)` ([#9880](https://github.com/tailwindlabs/tailwindcss/pull/9880))
+- Add `--watch=always` option to prevent exit when stdin closes ([#9966](https://github.com/tailwindlabs/tailwindcss/pull/9966))
 
 ### Fixed