Update CHANGELOG

Author: adamwathan

CHANGELOG.md

@@ -10,6 +10,17 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - Add `background-origin` utilities ([#4117](https://github.com/tailwindlabs/tailwindcss/pull/4117))
+- Improve `@apply` performance in projects that process many CSS sources ([#3178](https://github.com/tailwindlabs/tailwindcss/pull/3718))
+- JIT: Don't use CSS variables for color utilities if color opacity utilities are disabled ([#3984](https://github.com/tailwindlabs/tailwindcss/pull/3984))
+- JIT: Redesign `matchUtilities` API to make it more suitable for third-party use ([#4232](https://github.com/tailwindlabs/tailwindcss/pull/4232))
+
+### Fixed
+
+- JIT: Improve support for Svelte class bindings ([#4187](https://github.com/tailwindlabs/tailwindcss/pull/4187))
+- JIT: Improve support for `calc` and `var` in arbitrary values ([#4147](https://github.com/tailwindlabs/tailwindcss/pull/4147))
+- Convert `hsl` colors to `hsla` when transforming for opacity support instead of `rgba` ([#3850](https://github.com/tailwindlabs/tailwindcss/pull/3850))
+- Fix `backdropBlur` variants not being generated ([#4188](https://github.com/tailwindlabs/tailwindcss/pull/4188))
+- Improve animation value parsing ([#4250](https://github.com/tailwindlabs/tailwindcss/pull/4250))
 
 ## [2.1.2] - 2021-04-23