Update changelog

Author: adamwathan

CHANGELOG.md

@@ -7,7 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-- Nothing yet!
+### Added
+
+- Add support fo configuring default `font-feature-settings` for a font family ([#9039](https://github.com/tailwindlabs/tailwindcss/pull/9039))
 
 ## [3.1.8] - 2022-08-05