Future.set_running_or_notify_cancel returns bool (#1911)
Future.set_running_or_notify_cancel returns bool (#1911)

Future.set_running_or_notify_cancel returns a bool, not None. See commit
13bcc79c12496b324ac1501c6986996eb9ececb5, where this problem was fixed
for Python 2.
euresti/typeshed,li-dan/typeshed