新增优惠券列表的过期类型显示

app/Admin/Controllers/CouponManagement/CouponManagementController.php

@@ -90,6 +90,7 @@ class CouponManagementController extends AdminController
         $grid->column('discount', __('折扣'));
         $grid->column('position_type', __('发放平台'))->using([1=>'领券中心',2=>'后台发放']);
         $grid->column('num', __('数量'));
+        $grid->column('expire_type', __('过期时间'))->using([1=>'领取N天过期',2=>'设置固定时间']);
         $grid->column('effective_days', __('有效天数'));
         $grid->column('start_time', __('有效期开始时间'))->display(function ($time){
             if ($time ==0)