Update changelog

Author: adamwathan

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+Nothing yet!
+
+## [2.2.3] - 2021-06-23
+
 ### Added
 
 - Pass extended color palette to theme closures so it can be used without installing Tailwind when using `npx tailwindcss` ([359252c](https://github.com/tailwindlabs/tailwindcss/commit/359252c9b429e81217c28eb3ca7bab73d8f81e6d))