Update rfid_default_keys.ino
Update rfid_default_keys.ino

Updated code to account for serial behavior change in ATMEGA32U4
lpr0lpd/rfid,miguelbalboa/rfid,irhastofa/rfid,yaalsn/rfid,LaloHao/rfid,Rotzbua/rfid,prikevs/rfid,hramrach/rfid,1upon0/rfid,mirko314/rfid,Rotzbua/rfid,sophiekovalevsky/rfid,tamchau2809/rfid,webdevbrian/rfid,smallkid/rfid,mangine/mraa_MFRC522,northDacoder/rfid,r44947/rfid,CapeSepias/rfid,juantejedavz/rfid