Merge pull request #35 from adafruit/stemma_i2c

Added commented out board.STEMMA_I2C with explanation

Author: evaherrada

examples/ina219_simpletest.py

@@ -8,7 +8,8 @@
 from adafruit_ina219 import ADCResolution, BusVoltageRange, INA219
 
 
-i2c_bus = board.I2C()
+i2c_bus = board.I2C()  # uses board.SCL and board.SDA
+# i2c_bus = board.STEMMA_I2C()  # For using the built-in STEMMA QT connector on a microcontroller
 
 ina219 = INA219(i2c_bus)