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

Change-Id: I186ee7da0fec61797d53004dd1cfc5ec1133ca8e
diff --git a/package.json b/package.json
index ce2dc13..0c4b4e7 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "cord_workflow_controller",
-    "version": "0.5.3",
+    "version": "0.5.4",
     "description": "CORD Workflow Controller",
     "main": "src/server.js",
     "scripts": {