Update src/Service/CognitoIdentityProvider/CHANGELOG.md

Author: jderusse

src/Service/CognitoIdentityProvider/CHANGELOG.md

@@ -4,7 +4,7 @@
 
 ### Added
 
-- AWS api-change: This release adds refresh token rotation.
+- AWS api-change: methods `adminGetUser`, `adminInitiateAuth`, `getUser` and `initiateAuth` might throw an `UnsupportedOperationException`.
 
 ### Changed