improve(replace data modification with updateelements call)

src/index.js

@@ -53,7 +53,7 @@ const Spruce = {
     updateSubscribers(key, value) {
         this.subscribers.forEach(el => {
             if (el.__x !== undefined) {
-                el.__x.$data.spruce = value
+                el.__x.updateElements(el)
             }
         })
     },