[Library manager] PCF8591 library (Arduino, esp32 and esp8266)

[xreef]

Source: https://github.com/xreef/PCF8591_library
Tag: https://github.com/xreef/PCF8591_library/releases/tag/v1.0.1

Here Library to use pcf8591 i2c analog IC with Arduino, esp32 and esp8266.

Documentation
ENG --> https://www.mischianti.org/2019/01/03/pcf8591-i2c-analog-i-o-expander/
ITA --> https://www.mischianti.org/it/2019/01/03/pcf8591-un-expander-i2c-i-o-analogico/

Bye Renzo

[cmaglie]

Done.