Update README.md

NodeMcu is the way to go now

README.md

 # RfidShelf
 Make your shelf play MP3s!
 
-Use some cheap hardware (Arduino, RC522, VS1053 MP3 Shield) to create an RFID controlled MP3 (and more) shelf. Impression of the first prototype: https://www.youtube.com/watch?v=39uuoB3o7k8
+Use some cheap hardware (Esp8266/NodeMcu, RC522, VS1053 MP3 breakout board) to create an RFID controlled MP3 (and more) shelf. Impression of the first prototype: https://www.youtube.com/watch?v=39uuoB3o7k8