TransferCoordinator.results() hangs after cancel() is called

[cfxegbert]

s3transfer 0.6.0

When TransferCoordinator.cancel() is called it checks to see if it needs to call the announce_done() method. The only case it will call announce_done() is when the state is "not-done". If cancel() is called when the state is "queued" or "running" then announce_done() is not called. This causes the _done_event never to be set. Calling result() will block forever waiting for _done_event to be set.