Update CHANGELOG.md

Author: perthaarhus

CHANGELOG.md

@@ -2,7 +2,7 @@
 All notable changes to this project should be documented in this file.
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
-and this project adheres to [Semantic Versioning](5.0).
+and this project adheres to [Semantic Versioning](http://semver.org/).
 
 See ["how do I make a good changelog record?"](https://keepachangelog.com/en/1.0.0/#how) 
 before starting to add changes.