Update CHANGELOG.md (#3076)

Author: cte

CHANGELOG.md

@@ -7,7 +7,7 @@
 - Make retries respect the global auto approve checkbox
 - Fix a selection mode bug in the history view (thanks @jr)
 
-## 3.15.0 - 2025-04-30
+## [3.15.0] - 2025-04-30
 
 - Add prompt caching to the Google Vertex provider (thanks @ashktn)
 - Add a fallback mechanism for executing terminal commands if VSCode terminal shell integration fails