Rasa sdk dispatcher tracker difference

After updating my rasa core from 0.10 to 0.11

In the custom action file I wrote dispatcher and tracker in run function as:

games_list = tracker.get_slot(games)

but It gives me error AttributeError: ‘CollectingDispatcher’ object has no attribute ‘get_slot’ during executing. How should I resolve this issue?

Resolved in rasa_core 0.11.5