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!
+
+## [3.1.0] - 2022-06-08
+
 ### Fixed
 
 - Types: allow for arbitrary theme values (for 3rd party plugins) ([#7926](https://github.com/tailwindlabs/tailwindcss/pull/7926))
@@ -1948,7 +1952,8 @@ No release notes
 
 - Everything!
 
-[unreleased]: https://github.com/tailwindlabs/tailwindcss/compare/v3.0.24...HEAD
+[unreleased]: https://github.com/tailwindlabs/tailwindcss/compare/v3.1.0...HEAD
+[3.1.0]: https://github.com/tailwindlabs/tailwindcss/compare/v3.0.24...v3.1.0
 [3.0.24]: https://github.com/tailwindlabs/tailwindcss/compare/v3.0.23...v3.0.24
 [3.0.23]: https://github.com/tailwindlabs/tailwindcss/compare/v3.0.22...v3.0.23
 [3.0.22]: https://github.com/tailwindlabs/tailwindcss/compare/v3.0.21...v3.0.22