Merge pull request #2557 from kivy/_do_release

uix:ToggleButton Behavior make it consistent with ButtonBehavior

kivy/uix/behaviors.py

@@ -230,7 +230,7 @@ class ToggleButtonBehavior(ButtonBehavior):
         self._release_group(self)
         self.state = 'normal' if self.state == 'down' else 'down'
 
-    def _do_release(self):
+    def _do_release(self, *args):
         pass
 
     @staticmethod