Remove more simpleio

Author: Neradoc

README.rst

@@ -24,7 +24,6 @@ Dependencies
 This driver depends on:
 
 * `Adafruit CircuitPython <https://github.com/adafruit/circuitpython>`_
-* `SimpleIO Library <https://github.com/adafruit/Adafruit_CircuitPython_SimpleIO>`_
 
 Please ensure all dependencies are available on the CircuitPython filesystem.
 This is easily achieved by downloading

adafruit_rgbled.py

@@ -17,8 +17,6 @@
 
 * Adafruit CircuitPython firmware for the supported boards:
   https://github.com/adafruit/circuitpython/releases
-
-* Adafruit's SimpleIO library: https://github.com/adafruit/Adafruit_CircuitPython_SimpleIO
 """
 from pwmio import PWMOut