add DeleteMessage config

Signed-off-by: Jianqiu Zhang <zhangjianqiu13@gmail.com>

configs.go

@@ -697,6 +697,22 @@ type EditMessageTextConfig struct {
 	DisableWebPagePreview bool
 }
 
+type DeleteMessageConfig struct {
+	ChatID    int64 `json:"chat_id"`
+	MessageID int   `json:"message_id"`
+}
+
+func (config DeleteMessageConfig) values() (url.Values, error) {
+	v := url.Values{}
+	v.Add("chat_id", strconv.FormatInt(config.ChatID, 10))
+	v.Add("message_id", strconv.FormatInt(int64(config.MessageID), 10))
+	return v, nil
+}
+
+func (config DeleteMessageConfig) method() string {
+	return "deleteMessage"
+}
+
 func (config EditMessageTextConfig) values() (url.Values, error) {
 	v, err := config.BaseEdit.values()
 	if err != nil {

helpers.go

@@ -19,6 +19,13 @@ func NewMessage(chatID int64, text string) MessageConfig {
 	}
 }
 
+func NewDeleteMessage(chatID int64, messageID int) DeleteMessageConfig {
+	return DeleteMessageConfig{
+		ChatID:    chatID,
+		MessageID: messageID,
+	}
+}
+
 // NewMessageToChannel creates a new Message that is sent to a channel
 // by username.
 //