throwfly not properly added

[azeryn13]

when using the command 'tello.initiate_throw_takeoff()' I've noticed a few things.

Firstly, the command allows you to throw the drone in the air within 5 seconds to take off. But tello.py does not wait at all and just keeps trying to send new commands before the drone is even in the air.

Also, since it takes off form being thrown, shouldn't 'self.is_flying = True' be set in some way?

[M4GNV5]

I added the self.is_flying = True part, but i dont think there is a realiable way to check wether the takeoff actually ocurred and especially when it occured. I think it is up to the user to ask the user for takeoff confirmation or just wait 5 seconds.