fix: update changelog header to include comparison link for v1.6.0 release

Thavarshan · Thavarshan · commit adcce1f7126f · 2025-09-15T11:43:05.000+05:30
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # Release Notes
 
-## [v1.6.0] - 2025-09-15
+## [v1.6.0](https://github.com/Thavarshan/phpvm/compare/v1.5.0...v1.6.0) - 2025-09-15
 
 ### Added
 
