Correct sendPhoto request

src/MessageHandler.php

@@ -25,7 +25,7 @@ abstract class MessageHandler
     }
 
     protected function sendPhoto($chat, $file_id, $reply = null) {
-        return $this->makeRequest('sendSticker', array(
+        return $this->makeRequest('sendPhoto', array(
             'chat_id' => $chat,
             'photo' => $file_id,
             'reply_to_message_id' => $reply