Update CHANGELOG.md

Author: thomaseizinger

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [3.1.0] - 2024-07-27
+
 ### Added
 
 - Add a new `release-notes` output to the action containing the release notes for the newly released versions.
@@ -67,7 +69,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Initial release of this action!
 
-[unreleased]: https://github.com/thomaseizinger/keep-a-changelog-new-release/compare/3.0.0...HEAD
+[unreleased]: https://github.com/thomaseizinger/keep-a-changelog-new-release/compare/3.1.0...HEAD
+[3.1.0]: https://github.com/thomaseizinger/keep-a-changelog-new-release/compare/3.0.0...3.1.0
 [3.0.0]: https://github.com/thomaseizinger/keep-a-changelog-new-release/compare/2.0.0...3.0.0
 [2.0.0]: https://github.com/thomaseizinger/keep-a-changelog-new-release/compare/1.3.0...2.0.0
 [1.3.0]: https://github.com/thomaseizinger/keep-a-changelog-new-release/compare/1.2.1...1.3.0