material to be specific

medialist.go → material.go

 	return
 }
 
-func url4NewsList() string {
+func url4MaterialList() string {
 	atk, _ := GetAccessToken()
 	u := fmt.Sprintf("https://api.weixin.qq.com/cgi-bin/material/batchget_material?access_token=%s", atk)
 	return u
 }
 
-func url4MediaCount() string {
+func url4MaterialCount() string {
 	atk, _ := GetAccessToken()
 	u := fmt.Sprintf("https://api.weixin.qq.com/cgi-bin/material/get_materialcount?access_token=%s", atk)
 	return u