chore: update changelog

Author: doc-han

CHANGELOG.md

@@ -48,6 +48,8 @@ and this project adheres to
 
 ### Added
 
+- Add validation for edge expressions
+  [#3704](https://github.com/OpenFn/lightning/issues/3704)
 - Add missing adaptor and credential tooltips to the collab editor
   [#3919](https://github.com/OpenFn/lightning/issues/3919)
 - Show server validation errors in the collab editor forms