Sets the alarm handler - which will be called when triggered alarm. This function is active when the REQUIRESALARMS sensors.setAlarmHandler(handler)
sensors: a variable of type DallasTemperature.
handler: pointer to a function to be called when triggered alarm.
// function that will be called when an alarm condition exists during DallasTemperatures::processAlarms();
void newAlarmHandler(const uint8_t* deviceAddress) {