Upggrade xss to v1.0.3

package.json

@@ -28,6 +28,6 @@
     "es6-promise": "^4.2.4",
     "meteor-node-stubs": "^0.4.1",
     "os": "^0.1.1",
-    "xss": "^0.3.8"
+    "xss": "^1.0.3"
   }
 }