refactor: add eslint-plugin-vue && lint code (#976)

src/App.vue

@@ -1,11 +1,11 @@
 <template>
   <div id="app">
-    <router-view></router-view>
+    <router-view/>
   </div>
 </template>
 
 <script>
-  export default{
-    name: 'App'
-  }
+export default{
+  name: 'App'
+}
 </script>