BUG: does not handle own CancelledError on client.close()

[Andrei-Pozolotin]

1. great project, thank you

2. in v 0.4.5: BUG: does not handle own CancelledError on client.close():

2020-01-19 08:54:02 INFO aiocometd.client:287  close                   Closing client...
2020-01-19 08:54:02 ERRO      asyncio:199  exception_reactor       Exception in callback <bound method TransportBase._connect_done of <aiocometd.transports.websocket.WebSocketTransport object at 0x7f9e62e90fa0>>
handle: <Handle TransportBase._connect_done>
Traceback (most recent call last):
  File "uvloop/cbhandles.pyx", line 70, in uvloop.loop.Handle._run
  File "/usr/lib/python3.8/site-packages/aiocometd/transports/base.py", line 541, in _connect_done
    result: Union[JsonObject, Exception] = future.result()
asyncio.exceptions.CancelledError
2020-01-19 08:54:02 ERRO      asyncio:199  exception_reactor       Exception in callback <bound method WebSocketTransport._receive_done of <aiocometd.transports.websocket.WebSocketTransport object at 0x7f9e62e90fa0>>
handle: <Handle WebSocketTransport._receive_done>
Traceback (most recent call last):
  File "uvloop/cbhandles.pyx", line 70, in uvloop.loop.Handle._run
  File "/usr/lib/python3.8/site-packages/aiocometd/transports/websocket.py", line 261, in _receive_done
    result = future.result()
asyncio.exceptions.CancelledError
2020-01-19 08:54:03 INFO aiocometd.client:298  close                   Client closed.

3. in aiocometd/transports/base.py:
   https://github.com/robertmrk/aiocometd/blob/0.4.5/aiocometd/transports/base.py#L541

4. in aiocometd/transports/websocket.py:
   https://github.com/robertmrk/aiocometd/blob/0.4.5/aiocometd/transports/websocket.py#L261

5. in both cases these are internal tasks, which are both created and canceled by aiocometd,
   and they both propagate own aiocometd initiated CancelledError to the event loop
   exception handler

[Graeme22]

Same issue here. Is this project still maintained?

[Andrei-Pozolotin]

1. works in this fork:
   https://github.com/random-python/x_aiocometd
2. activate with pip via requirements.txt:

### aiocometd == 0.4.5 ### disable
aiocometd @ git+https://github.com/random-python/x_aiocometd@develop ### enalbe ###

[Graeme22]

1. works in this fork:
   https://github.com/random-python/x_aiocometd
2. activate with pip via requirements.txt:

### aiocometd == 0.4.5 ### disable
git+https://github.com/random-python/x_aiocometd@develop ### enalbe ###

This is great! Could you create a release so that if it's used as a dependency it can point to a specific version instead of the develop branch?

Made my own!