Update changelog

Author: adamwathan

CHANGELOG.md

@@ -22,6 +22,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Add `screen` function to improve nesting plugin compatibility ([#4318](https://github.com/tailwindlabs/tailwindcss/pull/4318))
 - JIT: Add universal shorthand color opacity syntax ([#4348](https://github.com/tailwindlabs/tailwindcss/pull/4348))
 - JIT: Add `@tailwind variants` directive to replace `@tailwind screens` ([#4356](https://github.com/tailwindlabs/tailwindcss/pull/4356))
+- JIT: Add support for PostCSS `dir-dependency` messages in `TAILWIND_DISABLE_TOUCH` mode ([#4388](https://github.com/tailwindlabs/tailwindcss/pull/4388))
+- JIT: Add per-side border color utilities ([#4404](https://github.com/tailwindlabs/tailwindcss/pull/4404))
 
 ### Fixed
 
@@ -36,6 +38,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fix JIT temp file storage when node temp directories are kept on a different drive than the project itself ([#4044](https://github.com/tailwindlabs/tailwindcss/pull/4044))
 - Support border-opacity utilities alongside default `border` utility ([#4277](https://github.com/tailwindlabs/tailwindcss/pull/4277))
 
+### Internals
+
+- Add integration tests for popular build runners ([#4354](https://github.com/tailwindlabs/tailwindcss/pull/4354))
+
 ## [2.1.2] - 2021-04-23
 
 ### Fixed