Celery 4.0.2 (buggy) -> Celery 4.2.0

[pvergain]

Hi !

Thank you for your project !

TL;DR the celery version should be 4.2.0 instead of 4.0.2.

With celery 4.0.2, I had the following error message:

dddemo-worker | Traceback (most recent call last):
dddemo-worker |   File "/site/env/bin/celery", line 11, in <module>
dddemo-worker |     sys.exit(main())
dddemo-worker |   File "/site/env/lib/python3.5/site-packages/celery/__main__.py", line 14, in main
dddemo-worker |     _main()
dddemo-worker |   File "/site/env/lib/python3.5/site-packages/celery/bin/celery.py", line 326, in main
dddemo-worker |     cmd.execute_from_commandline(argv)
dddemo-worker |   File "/site/env/lib/python3.5/site-packages/celery/bin/celery.py", line 488, in execute_from_commandline
dddemo-worker |     super(CeleryCommand, self).execute_from_commandline(argv)))
dddemo-worker |   File "/site/env/lib/python3.5/site-packages/celery/bin/base.py", line 281, in execute_from_commandline
dddemo-worker |     return self.handle_argv(self.prog_name, argv[1:])
dddemo-worker |   File "/site/env/lib/python3.5/site-packages/celery/bin/celery.py", line 480, in handle_argv
dddemo-worker |     return self.execute(command, argv)
dddemo-worker |   File "/site/env/lib/python3.5/site-packages/celery/bin/celery.py", line 412, in execute
dddemo-worker |     ).run_from_argv(self.prog_name, argv[1:], command=argv[0])
dddemo-worker |   File "/site/env/lib/python3.5/site-packages/celery/bin/worker.py", line 221, in run_from_argv
dddemo-worker |     return self(*args, **options)
dddemo-worker |   File "/site/env/lib/python3.5/site-packages/celery/bin/base.py", line 244, in __call__
dddemo-worker |     ret = self.run(*args, **kwargs)
dddemo-worker |   File "/site/env/lib/python3.5/site-packages/celery/bin/worker.py", line 255, in run
dddemo-worker |     **kwargs)
dddemo-worker |   File "/site/env/lib/python3.5/site-packages/celery/worker/worker.py", line 99, in __init__
dddemo-worker | self.setup_instance(**self.prepare_args(**kwargs))
dddemo-worker |   File "/site/env/lib/python3.5/site-packages/celery/worker/worker.py", line 122, in setup_instance
dddemo-worker |     self.should_use_eventloop() if use_eventloop is None
dddemo-worker |   File "/site/env/lib/python3.5/site-packages/celery/worker/worker.py", line 241, in should_use_eventloop
dddemo-worker |     self._conninfo.transport.implements.async and
dddemo-worker |   File "/site/env/lib/python3.5/site-packages/kombu/transport/base.py", line 125, in __getattr__
dddemo-worker |     raise AttributeError(key)