Update CHANGELOG.md

Author: dbanty

CHANGELOG.md

@@ -13,10 +13,6 @@ Programmatic usage of this project (e.g., importing it as a Python module) and t
 
 The 0.x prefix used in versions for this project is to indicate that breaking changes are expected frequently (several times a year). Breaking changes will increment the minor number, all other changes will increment the patch number. You can track the progress toward 1.0 [here](https://github.com/openapi-generators/openapi-python-client/projects/2).
 
-## Current main
-
-- Relative paths are now allowed in securitySchemes/OAuthFlow/tokenUrl (#618).
-
 ## 0.11.1
 
 ### Features