Write up changelog for 0.5.1

Author: deimonn

CHANGELOG.md

@@ -4,6 +4,13 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.5.1](https://github.com/deimonn/code-re2c/compare/v0.5.0...v0.5.1) - 2026-02-20
+
+### Fixed
+
+- Fixed documents already open on startup not getting their language detected by the extension
+- Fixed comment symbols `/*` and `*/` not getting colored properly at the start and end of re2c blocks for some themes
+
 ## [0.5.0](https://github.com/deimonn/code-re2c/compare/v0.4.0...v0.5.0) - 2026-02-13
 
 ### Added