[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/encryptor/encryptor.go

@@ -10,12 +10,12 @@ import (
 	"github.com/silenceper/wechat/v2/miniprogram/context"
 )
 
-//Encryptor struct
+// Encryptor struct
 type Encryptor struct {
 	*context.Context
 }
 
-//NewEncryptor 实例
+// NewEncryptor 实例
 func NewEncryptor(context *context.Context) *Encryptor {
 	basic := new(Encryptor)
 	basic.Context = context