update changelog

Author: RobinMalfait

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+- Nothing yet!
+
+## [3.0.4] - 2021-12-15
+
 ### Fixed
 
 - Insert always on defaults layer in correct spot ([#6526](https://github.com/tailwindlabs/tailwindcss/pull/6526))
@@ -1712,7 +1716,8 @@ No release notes
 
 - Everything!
 
-[unreleased]: https://github.com/tailwindlabs/tailwindcss/compare/v3.0.3...HEAD
+[unreleased]: https://github.com/tailwindlabs/tailwindcss/compare/v3.0.4...HEAD
+[3.0.4]: https://github.com/tailwindlabs/tailwindcss/compare/v3.0.3...v3.0.4
 [3.0.3]: https://github.com/tailwindlabs/tailwindcss/compare/v3.0.2...v3.0.3
 [3.0.2]: https://github.com/tailwindlabs/tailwindcss/compare/v3.0.1...v3.0.2
 [3.0.1]: https://github.com/tailwindlabs/tailwindcss/compare/v3.0.0...v3.0.1