docs: Add release date
docs: Add release date

jodal/pyspotify,jodal/pyspotify,kotamat/pyspotify,kotamat/pyspotify,jodal/pyspotify,felix1m/pyspotify,kotamat/pyspotify,felix1m/pyspotify,felix1m/pyspotify,mopidy/pyspotify,mopidy/pyspotify