message: Adds comment to changelog and corrects link in changelog
diff: @@ -4,6 +4,12 @@ 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).
  +<!--
  +################################################################################
  +### PLEASE LINK THE ISSUES IF THERE IS ONE, OTHERWISE LINK THE PULL-REQUESTS ###
  +################################################################################
  +-->
  +
  ## [NEXT]
  ### Added
  - Added the possibility to sort all courses alphabetically. [#567](https://github.com/h-da/geli/issues/567)
  