Fix changelog for IAM (#1359)

Fix changelog

Author: jderusse

CHANGELOG.md

@@ -8,15 +8,14 @@
 
 - Added `IamClient::listServiceSpecificCredentials()`
 - Added `IamClient::deleteServiceSpecificCredential()`
-
-## 1.3.0
-
-### Added
-
 - Added `IamClient::putUserPolicy()`
 - Added `IamClient::deleteUserPolicy()`
 - Added `IamClient::createServiceSpecificCredential()`
 
+## 1.3.0
+
+- Empty release
+
 ## 1.2.0
 
 ### Added