added new changelog entry

changelogs/changelog.yaml

@@ -28,4 +28,11 @@ releases:
   0.1.3:
     changes:
       release_date: "2023-04-20"
-      release_summary: "renamed all modules to names without systemd_ prefix"
+      release_summary: "renamed all modules to names without systemd_ prefix"
+  0.2.0:
+    changes:
+      release_date: "2023-04-21"
+      release_summary: "added an rudimentary system_service module"
+    modules:
+      - name: system_service
+        description: erstellt ein einfachen systemd system service