[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>

miniprogram/qrcode/qrcode.go

@@ -15,12 +15,12 @@ const (
 	getWXACodeUnlimitURL = "https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=%s"
 )
 
-//QRCode struct
+// QRCode struct
 type QRCode struct {
 	*context.Context
 }
 
-//NewQRCode 实例
+// NewQRCode 实例
 func NewQRCode(context *context.Context) *QRCode {
 	qrCode := new(QRCode)
 	qrCode.Context = context