Update changelog

Author: adamwathan

CHANGELOG.md

@@ -30,6 +30,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Fix defining colors as functions when color opacity plugins are disabled ([#5470](https://github.com/tailwindlabs/tailwindcss/pull/5470))
 
+## [2.2.16] - 2021-09-26
+
+### Fixed
+
+- JIT: Properly handle animations that use CSS custom properties ([#5602](https://github.com/tailwindlabs/tailwindcss/pull/5602))
+
 ## [2.2.15] - 2021-09-10
 
 ### Fixed
@@ -1582,7 +1588,8 @@ No release notes
 
 - Everything!
 
-[unreleased]: https://github.com/tailwindlabs/tailwindcss/compare/v2.2.15...HEAD
+[unreleased]: https://github.com/tailwindlabs/tailwindcss/compare/v2.2.16...HEAD
+[2.2.16]: https://github.com/tailwindlabs/tailwindcss/compare/v2.2.15...v2.2.16
 [2.2.15]: https://github.com/tailwindlabs/tailwindcss/compare/v2.2.14...v2.2.15
 [2.2.14]: https://github.com/tailwindlabs/tailwindcss/compare/v2.2.13...v2.2.14
 [2.2.13]: https://github.com/tailwindlabs/tailwindcss/compare/v2.2.12...v2.2.13