Fix an invalid array insertion using append (this should be push)

Change-Id: I186ee7da0fec61797d53004dd1cfc5ec1133ca8e
diff --git a/src/controllers/ws_manager.js b/src/controllers/ws_manager.js
index 539c415..29ae8b5 100644
--- a/src/controllers/ws_manager.js
+++ b/src/controllers/ws_manager.js
@@ -453,7 +453,7 @@
             // there must be a workflow matching
             // set workflow status
             let result = eventrouter.setWorkflowRunStatus(workflowRunId, status);
-            results.append(result);
+            results.push(result);
         });
 
         cb(null, results);