Reduce timeout to expire Sonos resource cache (#500)

Author: jjlawren

plexapi/myplex.py

@@ -217,7 +217,7 @@ def sonos_speakers(self):
             return []
 
         t = time.time()
-        if t - self._sonos_cache_timestamp > 60:
+        if t - self._sonos_cache_timestamp > 5:
             self._sonos_cache_timestamp = t
             data = self.query('https://sonos.plex.tv/resources')
             self._sonos_cache = [PlexSonosClient(self, elem) for elem in data]