Added overloaded method for sending a photo

include/Telegram/TelegramBot.h

@@ -41,6 +41,7 @@ namespace Telegram {
     void sendMessage(std::string, Json::Int64);
     void sendMessage(std::string, std::string);
 
+    void sendPhoto(std::string, Json::Int64);
     void sendPhoto(std::string, std::string);
 
     Telegram::Message *getMessage();

src/TelegramBot.cc

@@ -104,6 +104,14 @@ void Telegram::TelegramBot::sendMessage(std::string message, std::string chat_id
   this->apiRequestJson("sendMessage", params);
 }
 
+/**
+ * Sends a picture from the internet to a chat
+ */
+void Telegram::TelegramBot::sendPhoto(std::string URL, Json::Int64 chat_id) {
+
+	this->sendPhoto(URL, SSTR(chat_id));
+}
+
 /**
  * Sends a picture from the internet to a chat
  */