0.6.0 Added analog_read/analog_write

0.5.0 Added Pcf8591 mudule (ADC/DAC)

0.4.0 Added Software Tone PWM functions wrappers

0.3.0 Added Software PWM, added instructions for libws281x, but not enabled

0.2.0 Added PWM pin control functions

0.1.0 Added GPIO basic functions: read and write

0.1.0 Added Pcf8591 module to setup pins