docs: changelog number

Author: isc-cge

CHANGELOG.md

@@ -5,10 +5,10 @@ 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).
 
-## [4.0.3] - 2024-08-16
+## [4.0.3] - Unreleased
 
 ### Changed 
-- #53: Method mapping code now doesn't use AST's endline_no property to support older python versions 
+- #52: Method mapping code now doesn't use AST's endline_no property to support older python versions 
 
 ## [4.0.2] - 2024-08-16