docs: update changelog

Author: t-graf

ChangeLog.md

@@ -3,6 +3,7 @@
 ## NEXT
 * new method `update_project_release_relationship`.
 * original get_health_status() endpoint URL has been restored by the SW360 team.
+* fix: better check assumptions on returned data, see https://github.com/sw360/sw360python/issues/5.
 
 ## 1.1.0
 * New method `duplicate_project` to create a copy of an existing project.