Fix changelog

Author: achamayou

CHANGELOG.md

@@ -5,9 +5,9 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## [5.0.0-12]
+## [5.0.12]
 
-[5.0.0-12]: https://github.com/microsoft/CCF/releases/tag/5.0.0-12
+[5.0.12]: https://github.com/microsoft/CCF/releases/tag/5.0.12
 
 ### Fixed