Add missing entry in changelog (#1572)

Author: jderusse

src/Service/Sso/CHANGELOG.md

@@ -4,8 +4,8 @@
 
 ### Added
 
-- Added region `il-central-1`
-- AWS api-change: TODO
+- AWS api-change: Add support for the `il-central-1` region
+- AWS api-change: Add support for the `eu-central-2`, `cn-north-1` and `cn-northwest-1` regions
 
 ## 0.1.0