remove unused imports

Author: dwasinge

src/main/java/com/redhat/labs/lodestar/service/EngagementService.java

@@ -21,7 +21,6 @@
 import com.redhat.labs.lodestar.config.JsonMarshaller;
 import com.redhat.labs.lodestar.exception.UnexpectedGitLabResponseException;
 import com.redhat.labs.lodestar.models.Engagement;
-import com.redhat.labs.lodestar.models.EngagementUser;
 import com.redhat.labs.lodestar.models.Status;
 import com.redhat.labs.lodestar.models.gitlab.Action;
 import com.redhat.labs.lodestar.models.gitlab.Commit;