bumps pi finder package to 2.2.0
bumps pi finder package to 2.2.0

fixes #48

octoblu/Adafruit-Pi-Finder,CalmEQ/calmeq-pi-setup,adafruit/Adafruit-Pi-Finder,CalmEQ/calmeq-pi-setup,adafruit/Adafruit-Pi-Finder,StealthMicro/Adafruit-Pi-Finder,CalmEQ/calmeq-pi-setup,StealthMicro/Adafruit-Pi-Finder,octoblu/Adafruit-Pi-Finder