[Improvement] extract component common part (#703)

packages/coupon-list/Item.vue

@@ -22,7 +22,7 @@
 import { create } from '../utils';
 
 export default create({
-  name: 'van-coupon-item',
+  name: 'coupon-item',
 
   props: {
     data: Object,

packages/coupon-list/index.vue

@@ -49,19 +49,15 @@
 
 <script>
 import { create } from '../utils';
-import Cell from '../cell';
-import CellGroup from '../cell-group';
 import CouponItem from './Item';
 import Field from '../field';
 import VanButton from '../button';
 
 export default create({
-  name: 'van-coupon-list',
+  name: 'coupon-list',
 
   components: {
     VanButton,
-    Cell,
-    CellGroup,
     Field,
     CouponItem
   },