rfid status may fail for some readers!

src/main.cpp

@@ -511,7 +511,7 @@ void setup()
   // Init SPI bus
   SPI.begin(-1, -1, -1, CS_RFID);
   rfid.PCD_Init(CS_RFID, RST_RFID);
-
+/*
   if (rfid.PCD_PerformSelfTest())
   {
     Serial.println("RFID OK");
@@ -520,7 +520,7 @@ void setup()
   {
     Serial.println("RFID Self Test failed!");
   }
-
+*/
   audio.setPinout(I2S_BCLK, I2S_LRC, I2S_DOUT);
   audio.setVolume(volume); // 0...21