modify tutorial.md code style (#177)

berwin · yyx990803 · commit 379000d4d39a · 2016-05-13T11:29:45.000-04:00
modify code style
diff --git a/docs/zh-cn/tutorial.md b/docs/zh-cn/tutorial.md
@@ -158,7 +158,7 @@ export const incrementCounter = function ({ dispatch, state }) {
 
 然后我们从 `components/Increment.vue` 组件里调用 action 函数
 
-```
+```html
 <template>
   <div>
     <button @click='increment'>Increment +1</button>
