Update changelog

CHANGELOG.md

@@ -7,10 +7,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+- Nothing yet!
+
+## [3.1.1] - 2022-06-09
+
 ### Fixed
 
 - Fix candidate extractor regression ([#8558](https://github.com/tailwindlabs/tailwindcss/pull/8558))
-- Split `::backdrop`` into separate defaults group ([#8567](https://github.com/tailwindlabs/tailwindcss/pull/8567))
+- Split `::backdrop` into separate defaults group ([#8567](https://github.com/tailwindlabs/tailwindcss/pull/8567))
 - Fix postcss plugin type ([#8564](https://github.com/tailwindlabs/tailwindcss/pull/8564))
 - Fix class detection in markdown code fences and slim templates ([#8569](https://github.com/tailwindlabs/tailwindcss/pull/8569))
 
@@ -1957,7 +1961,8 @@ No release notes
 
 - Everything!
 
-[unreleased]: https://github.com/tailwindlabs/tailwindcss/compare/v3.1.0...HEAD
+[unreleased]: https://github.com/tailwindlabs/tailwindcss/compare/v3.1.1...HEAD
+[3.1.1]: https://github.com/tailwindlabs/tailwindcss/compare/v3.1.0...v3.1.1
 [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