use climits for MAX_ULONG

check if received ip from api has at least a :

src/api/TelegramAPI.cpp

@@ -3,8 +3,9 @@
 //
 
 #include "api/TelegramAPI.h"
+#include "Logger.h"
 
-#include <Logger.h>
+#include <climits>
 
 int TelegramAPI::sendMessage(const std::string& text) {
     Hashmap<std::string, std::string> args;
@@ -15,7 +16,6 @@ int TelegramAPI::sendMessage(const std::string& text) {
 
     std::string reply = request("https://api.telegram.org/bot" + apikey + "/sendmessage", false, args, headers);
 
-    unsigned const long ULONG_MAX = -1;
     if (reply.find("\"error_code\"") != ULONG_MAX) {
         Logger::error("failed to refresh the ip (Dynu API)");
         return -1;