Merge pull request #6 from brentru/add-deps-to-readme

Add SimpleIO and ESP libraries to README

Author: kattni

README.rst

@@ -20,6 +20,8 @@ Dependencies
 This driver depends on:
 
 * `Adafruit CircuitPython <https://github.com/adafruit/circuitpython>`_
+* `Adafruit CircuitPython SimpleIO <https://github.com/adafruit/Adafruit_CircuitPython_SimpleIO>`_
+* `Adafruit CircuitPython ESP32SPI <https://github.com/adafruit/Adafruit_CircuitPython_ESP32SPI>`_
 
 Please ensure all dependencies are available on the CircuitPython filesystem.
 This is easily achieved by downloading