Update CHANGELOG

CHANGELOG.md

@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+
+## [0.12.0] - 2024-02-15
 ### Added
 - Multi-window support. [#1964](https://github.com/iced-rs/iced/pull/1964)
 - `TextEditor` widget (or multi-line text input). [#2123](https://github.com/iced-rs/iced/pull/2123)
@@ -740,7 +742,8 @@ Many thanks to...
 ### Added
 - First release! :tada:
 
-[Unreleased]: https://github.com/iced-rs/iced/compare/0.10.0...HEAD
+[Unreleased]: https://github.com/iced-rs/iced/compare/0.12.0...HEAD
+[0.12.0]: https://github.com/iced-rs/iced/compare/0.10.0...0.12.0
 [0.10.0]: https://github.com/iced-rs/iced/compare/0.9.0...0.10.0
 [0.9.0]: https://github.com/iced-rs/iced/compare/0.8.0...0.9.0
 [0.8.0]: https://github.com/iced-rs/iced/compare/0.7.0...0.8.0