[bugfix] remove unnecessary props (#323)

* 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

packages/icon/index.vue

@@ -7,12 +7,8 @@
 <script>
 export default {
   name: 'van-icon',
-
   props: {
-    name: {
-      type: String,
-      required: true
-    }
+    name: String
   }
 };
 </script>