modify changelog

Former-commit-id: c7448a91938c65c997df94c0929e4dfb53bb19a6

cpp/CHANGELOG.md

@@ -12,10 +12,11 @@ Please mark all change in change log and use the ticket from JIRA.
 
 - MS-5 - Implement Auto Archive Feature
 - MS-16 - Implement metrics without prometheus
+- MS-6 - Implement SDK interface part 1
+- MS-21 - Implement SDK interface part 2
+
 ### Task
 
 - MS-1 - Add CHANGELOG.md
 - MS-4 - Refactor the vecwise_engine code structure
-- MS-6 - Implement SDK interface part 1
 - MS-20 - Clean Code Part 1
-- MS-6 - Implement SDK interface part 2