Merge pull request #15 from adafruit/stemma_i2c

Added commented out board.STEMMA_I2C with explanation

Author: evaherrada

examples/ssd1305_pillow_demo.py

@@ -31,7 +31,8 @@
 oled = adafruit_ssd1305.SSD1305_SPI(WIDTH, HEIGHT, spi, oled_dc, oled_reset, oled_cs)
 
 # Use for I2C.
-# 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
 # oled = adafruit_ssd1305.SSD1305_I2C(WIDTH, HEIGHT, i2c, addr=0x3c, reset=oled_reset)
 
 # Clear display.