Removed serial print on termocouples library (#48)

Author: Rocketct

src/utility/THERMOCOUPLE/MAX31855.cpp

@@ -99,7 +99,6 @@ float MAX31855Class::readTemperature(int type)
     // conversion factor from K type to J type
     celsius = celsius * 4/5; 
   }
-    Serial.println(celsius);
   return celsius;
 }