[Improvement] optimize staticClass (#337)

* fix: Tabbar icon line-height

* [new feature] progress add showPivot prop

* [new feature] TabItem support vue-router

* [new feature] update document header style

* [Doc] add toast english ducoment

* [bugfix] Search box-sizing wrong

* [Doc] update vant-demo respo

* [Doc] translate theme & demo pages

* [Doc] add Internationalization document

* [bugfix] remove unnecessary props

* [fix] optimize clickoutside

* [new feature] optimize find-parent

* [new feature]: change document title accordinng to language

* [new feature] Pagination code review

* [improvement] adjust icon-font unicode

* [improvement] Icon spinner color inherit

* [improvement] icon default width

* [bugfix] DateTimePicker validate date props

* [bugfix] Tab item text ellipsis

* [improvement] optimize single line ellipsis

* [Improvement] optimzie staticClass

packages/goods-action-mini-btn/index.vue

@@ -1,6 +1,6 @@
 <template>
   <a :href="url" class="van-goods-action__mini-btn van-hairline" @click="$emit('click', $event);">
-    <van-icon :class="['van-goods-action__mini-btn-icon', iconClass]" :name="icon" />
+    <van-icon class="van-goods-action__mini-btn-icon" :class="iconClass" :name="icon" />
     <slot></slot>
   </a>
 </template>