Merge pull request #392 from TimJay/master

requests_cache compatibility

spotipy/client.py

@@ -133,6 +133,7 @@ class Spotify(object):
                 raise SpotifyException(r.status_code,
                     -1, '%s:\n %s' % (r.url, 'error'), headers=r.headers)
         finally:
+            if hasattr(r, "connection"):
                 r.connection.close()
         if r.text and len(r.text) > 0 and r.text != 'null':
             results = r.json()