message: CHANGELOG: Rename [NEXT] to [Unreleased]
  This is for compliance with
  as noted by in his review for the corresponding PR.
diff: @@ -10,7 +10,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
  ################################################################################
  -->
  -## [NEXT]
  +## [Unreleased]
  ### Added
  - Added cookie information banner. [#565](https://github.com/geli-lms/geli/pull/565)
  - Course progress can now be exported as a CSV-file. [#766](https://github.com/geli-lms/geli/pull/766)
  