Probrem get_controllables api

lgsvl.get_controllables api requesting parameter mistake

https://github.com/lgsvl/simulator/blob/2020.05/Assets/Scripts/Api/Commands/ControllableGetAll.cs#L23

Simulator implementd requesting "control_type" value but python api send "type"
https://github.com/lgsvl/PythonAPI/blob/2020.05/lgsvl/simulator.py#L274

sorry_ for my poor english