[Improvement] follow eslint-plugin-vue strongly-recommended code style (#482)

packages/icon/index.vue

@@ -1,6 +1,6 @@
 <template>
   <i class="van-icon" :class="`van-icon-${name}`" v-on="$listeners">
-    <slot></slot>
+    <slot />
     <div v-if="info" class="van-icon__info">{{ info }}</div>
   </i>
 </template>
@@ -10,7 +10,9 @@ import install from '../utils/install';
 
 export default {
   install,
+
   name: 'van-icon',
+
   props: {
     name: String,
     info: String