update example

Author: yyx990803

examples/todoApp/index.html

@@ -13,7 +13,7 @@
       <ul>
         <li v-for="item in items" track-by=".key">
           {{ item.text }}
-          <span @click="removeTodo(item['.key'])">X</span>
+          <button @click="removeTodo(item['.key'])">X</button>
         </li>
       </ul>
       <form @submit.prevent="addTodo">
@@ -24,7 +24,7 @@
 
     <script>
       /* global Vue, Firebase */
-      var itemsRef = new Firebase('https://ReactFireTodoApp.firebaseio.com/items/')
+      var itemsRef = new Firebase('https://vuefiredemo.firebaseio.com/items/')
 
       new Vue({
         el: '#app',