Update CHANGELOG.md

Author: levinzonr

CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to Mosaic 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).
 
-## Unreleased
+## [Unreleased]
 
 ## 1.0.0 - 14.05.2024