session: Fix warning about unclosed file handle in Python 3
session: Fix warning about unclosed file handle in Python 3

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