Update notes.py

Match 204 status with swagger.yml

Author: acsany

flask-connexion-rest-part-3/rp_flask_api/notes.py

@@ -32,7 +32,7 @@ def delete(note_id):
     if existing_note:
         db.session.delete(existing_note)
         db.session.commit()
-        return make_response(f"{note_id} successfully deleted", 200)
+        return make_response(f"{note_id} successfully deleted", 204)
     else:
         abort(404, f"Note with ID {note_id} not found")