Updated adafruit_si4713.py to also recognize the si4721 chip. #18
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The SI4721 has an additional digital audio input but also an analog input.
It is backward compatible and will work in analog input mode as the si4713 chip.
I have not yet tested the digital input, this will be done later.
The only difference in the code: The SI4721 will return the product number 21 in stead of 13, the init function has been modified to accept either 13 or 21.