Update README.md

Add note to expansion connector A5 pin
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Mr.Blinky 2020-05-01 17:42:29 +02:00 committed by GitHub
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@ -124,7 +124,7 @@ TX* - Serial Transmitter output
RX - Serial Receiver input / original Flash cart chip select
SCL* - I2C/TWI serial clock I/O
SDA* - I2C/TWI serial data I/O / new Flash cart chip select (Arduboy FX)
A5 - Analog input pin
A5 - Analog input pin (Note not broken out on Pro Micro boards)
KEY - Key pin. should be filled to block pin insertion (reverse insert protection)
MISO - SPI/ICSP Master Input, Slave Output
MOSI - SPI/ICSP Master Output, Slave Input