Merge pull request #8 from adafruit/stemma_i2c

Added commented out board.STEMMA_I2C with explanation

Author: evaherrada

examples/tc74_simpletest.py

@@ -5,7 +5,8 @@
 import board
 import adafruit_tc74
 
-i2c = board.I2C()
+i2c = board.I2C()  # uses board.SCL and board.SDA
+# i2c = board.STEMMA_I2C()  # For using the built-in STEMMA QT connector on a microcontroller
 tc = adafruit_tc74.TC74(i2c)
 
 while True: