samall typo

ideas/cmd_parser.cpp

@@ -26,7 +26,7 @@ void outputPayload(payload_t payload)
 {
     
     for (int i = 0; i < 12; ++i)
-        std::cout << std::hex << std::setfill('0') << std::setw(2) << payload[i] << " ";
+        std::cout << std::hex << std::setfill('0') << std::setw(2) << +payload[i] << " ";
     std::cout << std::endl;
 }