Update CHANGELOG.md

Signed-off-by: Patryk Wrobel <183546751+pwrobeldev@users.noreply.github.com>

Author: pwrobeldev

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Unreleased
 ### Features
  * Dart/Flutter: the generated code is now compatible with Flutter 3.29 and above. When the user invokes the callback created for lambda/interface from the thread that is the main isolate thread, but outside of isolate context then it is correclty executed. Before this release the thread would deadlock. Now the generated code identifies such case and enters the isolate context before invoking the callback.
+ * Common: introduced LIME DOC validation rules. Users may use the new CLI parameter called `-docsvalidationrules` or CMake parameter `GLUECODIUM_DOCS_VALIDATION_RULES`, which allow specifying JSON file with regular expressions used to validate comments for certain LIME elements. More information can be found in `lime_markdown.md`.
 
 ## 13.12.0
 Release date 2025-03-24