Add changelog

Khushboo · Khushboo · commit 2bde72b05cef · 2022-04-22T12:53:22.000+05:30
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
@@ -167,6 +167,7 @@ Added
 * Added garbage collection for workflow execution and task execution objects #4924
   Contributed by @srimandaleeka01 and @amanda11
 
+* Added graceful shutdown for workflow engine. #5463
 
 Fixed
 ~~~~~
