[feature] Format the code and improve Mini Program authorization to o… (#473)

* [feature] Format the code and improve Mini Program authorization to obtain openid（miniprogram/auth/auth.go Code2Session）

* [feature] CheckEncryptedData (https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/user-info/auth.checkEncryptedData.html)

* upgrade json error

* upgrade json error

Co-authored-by: houseme <houseme@outlook.com>

pay/notify/notify.go

@@ -4,12 +4,12 @@ import (
 	"github.com/silenceper/wechat/v2/pay/config"
 )
 
-//Notify 回调
+// Notify 回调
 type Notify struct {
 	*config.Config
 }
 
-//NewNotify new
+// NewNotify new
 func NewNotify(cfg *config.Config) *Notify {
 	return &Notify{cfg}
 }