[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>

officialaccount/device/device.go

@@ -19,12 +19,12 @@ const (
 	uriState        = "https://api.weixin.qq.com/device/get_stat"
 )
 
-//Device struct
+// Device struct
 type Device struct {
 	*context.Context
 }
 
-//NewDevice 实例
+// NewDevice 实例
 func NewDevice(context *context.Context) *Device {
 	device := new(Device)
 	device.Context = context