Adjust changelog md to release 0.3.20

CHANGELOG.md

@@ -4,18 +4,14 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## 0.3.21
-### Added
-- Length for Column "SUB_PROTOCOL_BODY" has been extended to 2048.
-## fixed
-- Fix done for encoding input parameter to get shell look up api.
-- Fixed response for GetDescription api.
-
 ## 0.3.20
 ### Added
+- Length for Column "SUB_PROTOCOL_BODY" has been extended to 2048.
 
 ## fixed
 - Fixed Open api specification by adding the context root.
+- Fix done for encoding input parameter to get shell look up api.
+- Fixed response for GetDescription api.
 
 ## 0.3.19
 ### Added