Merge pull request #3 from rhooper/fix-group

fix group to not crash

Author: kattni

adafruit_led_animation/animation/__init__.py

@@ -146,7 +146,7 @@ def peers(self, peer_list):
         :param list peer_list: List of peer animations.
         """
         if peer_list is not None:
-            self._peers = [self] + peer_list
+            self._peers = [self] + list(peer_list)
 
     def freeze(self):
         """