Update spotify.py
Update spotify.py

Added option to play context_uris by passing in a URI as argument
pmpkk/openhab_spotify-webconnect-api,unparagoned/openhab_spotify-webconnect-api,pmpkk/openhab_spotify-webconnect-api,unparagoned/openhab_spotify-webconnect-api,unparagoned/openhab_spotify-webconnect-api