Merge pull request #202 from ckeyer/add_ThumbURL

add ThumbURL

README.md

@@ -3,7 +3,6 @@
 [![Go Report Card](https://goreportcard.com/badge/github.com/silenceper/wechat)](https://goreportcard.com/report/github.com/silenceper/wechat)
 [![GoDoc](http://godoc.org/github.com/silenceper/wechat?status.svg)](http://godoc.org/github.com/silenceper/wechat)
 
-
 使用Golang开发的微信SDK，简单、易用。
 
 ## 快速开始
@@ -46,6 +45,10 @@ server.Send()
 - Beego: [./examples/beego/beego.go](./examples/beego/beego.go)
 - Gin Framework: [./examples/gin/gin.go](./examples/gin/gin.go)
 
+## 交流群：
+![关注公众号入群交流](https://silenceper.oss-cn-beijing.aliyuncs.com/qrcode/qr_code_study_program_258.jpg)
+>关注公众号并回复“入群”
+
 ## 基本配置
 
 ```go

material/material.go

@@ -32,6 +32,7 @@ func NewMaterial(context *context.Context) *Material {
 type Article struct {
 	Title            string `json:"title"`
 	ThumbMediaID     string `json:"thumb_media_id"`
+	ThumbURL         string `json:"thumb_url"`
 	Author           string `json:"author"`
 	Digest           string `json:"digest"`
 	ShowCoverPic     int    `json:"show_cover_pic"`