Use decor 0.5.x to get multi-argument notifyCurrentValue() method.

Refs ibm-js/decor#14.

Author: wkeese

bower.json

@@ -3,7 +3,7 @@
 	"version": "0.6.0-alpha.2",
 	"dependencies": {
 		"dcl": "1.1.x",
-		"decor": "0.4.x",
+		"decor": "0.5.x",
 		"dpointer": "0.4.x",
 		"jquery": ">=2.1",
 		"lie": ">=2.8",