chore: update JetBrains changelog (#1499)

Author: ymc9

packages/ide/jetbrains/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 ### Added
+- Support comparing fields from different models in mutation policy rules ("create", "update", and "delete).
+
+## 2.1.0
+### Added
 - Support using ZModel type names (e.g., `DateTime`) as model field names.
 - `auth()` is resolved from all reachable schema files.