Update src/Service/Translate/CHANGELOG.md

Author: jderusse

src/Service/Translate/CHANGELOG.md

@@ -7,7 +7,7 @@
 - AWS api-change: Added `us-isof-east-1`  and `us-isof-south-1` regions
 - AWS api-change: Added `us-iso-east-1-fips` region
 - ```
-- AWS api-change: TODO
+- AWS api-change: Define list of supported region
 
 ## 1.1.0