Updated changelog

Author: emann

CHANGELOG.md

@@ -5,6 +5,10 @@ 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).
 
 
+## 0.5.2 - unreleased
+### Fixes
+- The generated library's version is now the same as the OpenAPI doc's version
+
 ## 0.5.1 - 2020-08-05
 ### Fixes
 - Relative paths are now allowed in securitySchemes/OAuthFlow/tokenUrl (#130).