Does not run with python-3.9.6

[glensc]

With 42c2439 commit, can not run with python-3.9.6

(52416) wsgi starting up on http://0.0.0.0:5002
(52416) wsgi exited, is_accepting=True
Serving static files from: /Users/glen/websocket_terminal/client/src
listening on :5002
Traceback (most recent call last):
  File "/Users/glen/websocket_terminal/server-python3/websocket_terminal.py", line 9, in <module>
    main()
  File "/Users/glen/websocket_terminal/server-python3/websocket_terminal.py", line 5, in main
    server.main()
  File "/Users/glen/websocket_terminal/server-python3/server.py", line 144, in main
    start_default(args.listen, args.port, args.unsafe)
  File "/Users/glen/websocket_terminal/server-python3/server.py", line 139, in start_default
    start(interface, port, root_app.handler)
  File "/Users/glen/websocket_terminal/server-python3/server.py", line 131, in start
    eventlet.wsgi.server(listener, root_app_handler)
  File "/Users/glen/websocket_terminal/.direnv/python-3.9.6/lib/python3.9/site-packages/eventlet/wsgi.py", line 980, in server
    client_socket, client_addr = sock.accept()
  File "/Users/glen/websocket_terminal/.direnv/python-3.9.6/lib/python3.9/site-packages/eventlet/greenio/base.py", line 230, in accept
    self._trampoline(fd, read=True, timeout=self.gettimeout(), timeout_exc=_timeout_exc)
  File "/Users/glen/websocket_terminal/.direnv/python-3.9.6/lib/python3.9/site-packages/eventlet/greenio/base.py", line 208, in _trampoline
    return trampoline(fd, read=read, write=write, timeout=timeout,
  File "/Users/glen/websocket_terminal/.direnv/python-3.9.6/lib/python3.9/site-packages/eventlet/hubs/__init__.py", line 155, in trampoline
    listener = hub.add(hub.READ, fileno, current.switch, current.throw, mark_as_closed)
  File "/Users/glen/websocket_terminal/.direnv/python-3.9.6/lib/python3.9/site-packages/eventlet/hubs/kqueue.py", line 53, in add
    self._control([event], 0, 0)
  File "/Users/glen/websocket_terminal/.direnv/python-3.9.6/lib/python3.9/site-packages/eventlet/hubs/kqueue.py", line 39, in _control
    return self.kqueue.control(events, max_events, timeout)
TypeError: changelist must be an iterable of select.kevent objects