Added led component
Added MIDI input to pedalboard
Updated start script to use LED component

Switched around pin numbers to match current config
Added long press to pedal
Rejigged patch numbers
Updated light_if to not use proc
Updated start script to use long press
Updated pins to match actual board
Added spec for pot
Added ci gem group

Travis wasn't installing test gems as it does a bundle install
--deployment. Hoping that adding a :ci group will
resolve this as bundler will still install rspec and pry.