changelog formatting

Author: mroote

CHANGELOG.md

@@ -3,7 +3,7 @@ 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/).
 
-## [0.9.0] 2021-01-07
+## [0.9.0] - 2021-01-07
 ### Added
 - Autostart factorio, when starting the server-manager - Thanks to @Psychomantis71