fix meinside/telegram-bot-go's EditMessageText response

apiresponsebool.diff

diff --git a/methods.go b/methods.go
index 55a6eca..7c997a7 100644
--- a/methods.go
+++ b/methods.go
@@ -723,7 +723,7 @@ func (b *Bot) AnswerCallbackQuery(callbackQueryID string, options map[string]int
 // other options: parse_mode, disable_web_page_preview, and reply_markup
 //
 // https://core.telegram.org/bots/api#editmessagetext
-func (b *Bot) EditMessageText(text string, options map[string]interface{}) (result APIResponseMessage) {
+func (b *Bot) EditMessageText(text string, options map[string]interface{}) (result APIResponseBool) {
 	// essential params
 	params := map[string]interface{}{
 		"text": text,
@@ -735,7 +735,7 @@ func (b *Bot) EditMessageText(text string, options map[string]interface{}) (resu
 		}
 	}
 
-	return b.requestResponseMessage("editMessageText", params)
+	return b.requestResponseBool("editMessageText", params)
 }
 
 // EditMessageCaption edits caption of a message
@@ -1411,6 +1411,27 @@ func (b *Bot) requestResponseInt(method string, params map[string]interface{}) (
 	return APIResponseInt{APIResponseBase: APIResponseBase{Ok: false, Description: &errStr}}
 }
 
+// Send request for APIResponseBool and fetch its result.
+func (b *Bot) requestResponseBool(method string, params map[string]interface{}) (result APIResponseBool) {
+	var errStr string
+
+	if bytes, err := b.request(method, params); err == nil {
+		var jsonResponse APIResponseBool
+		err := json.Unmarshal(bytes, &jsonResponse)
+		if err == nil {
+			return jsonResponse
+		}
+
+		errStr = fmt.Sprintf("json parse error: %s (%s)", err, string(bytes))
+	} else {
+		errStr = fmt.Sprintf("%s failed with error: %s", method, err)
+	}
+
+	b.error(errStr)
+
+	return APIResponseBool{APIResponseBase: APIResponseBase{Ok: false, Description: &errStr}}
+}
+
 // Send request for APIResponseString and fetch its result.
 func (b *Bot) requestResponseString(method string, params map[string]interface{}) (result APIResponseString) {
 	var errStr string
diff --git a/types.go b/types.go
index 01ccf93..96b9f29 100644
--- a/types.go
+++ b/types.go
@@ -196,6 +196,12 @@ type APIResponseInt struct {
 	Result int `json:"result,omitempty"`
 }
 
+// APIResponseBool is an API response with result type: bool
+type APIResponseBool struct {
+	APIResponseBase
+	Result bool `json:"result,omitempty"`
+}
+
 // APIResponseString is an API response with result type: string
 type APIResponseString struct {
 	APIResponseBase