WIP: Add structure to the CHANGELOG file
Summary
This is an example for a better structuring of the CHANGELOG.md
file. It adds the following subsections
- added: New feature
- fixed: Bug fix
- changed: Feature change
- deprecated: New deprecation
- removed: Feature removal
- performance: Performance improvement
- other: Other
see also https://keepachangelog.com/en/1.1.0/ and https://docs.gitlab.com/ee/development/changelog.html.