Update README.md (#1452)
Update README.md (#1452)

I struggled with this for the 4th time on new phoniebox installations and most pinout graphs for these card leave the cable for IRQ out and although you can read a card on python phoniebox does not read anything. With the cable in place on that pin it works like a charm from the beginning.
MiczFlor/RPi-Jukebox-RFID,MiczFlor/RPi-Jukebox-RFID,MiczFlor/RPi-Jukebox-RFID,MiczFlor/RPi-Jukebox-RFID,MiczFlor/RPi-Jukebox-RFID