Attribute error: 'MicroserviceRegisterWorker' object has no attribute 'deinit'

[Relrin]

When the Sanic framework is using the sanic-amqp-extension package and register a custom worker which is registering microservice, before stopping the server it throws an error for deinitialization.
Error traceback from game-servers-pool microservice:

Traceback (most recent call last):
  File "./manage.py", line 14, in <module>
    manager.run()
  File "/usr/local/lib/python3.6/site-packages/sanic_script/__init__.py", line 350, in run
    result = self.handle(argv[0], argv[1:])
  File "/usr/local/lib/python3.6/site-packages/sanic_script/__init__.py", line 319, in handle
    res = handle(*args, **config)
  File "/usr/local/lib/python3.6/site-packages/sanic_script/commands.py", line 195, in __call__
    return self.run(*args, **kwargs)
  File "/app/app/commands/run_server.py", line 23, in run
    workers=self.app.config["APP_WORKERS"],
  File "/usr/local/lib/python3.6/site-packages/sanic/app.py", line 646, in run
    serve(**server_settings)
  File "/usr/local/lib/python3.6/site-packages/sanic/server.py", line 648, in serve
    trigger_events(after_stop, loop)
  File "/usr/local/lib/python3.6/site-packages/sanic/server.py", line 496, in trigger_events
    loop.run_until_complete(result)
  File "uvloop/loop.pyx", line 1364, in uvloop.loop.Loop.run_until_complete
  File "/usr/local/lib/python3.6/site-packages/sanic_amqp_ext/__init__.py", line 86, in aioamqp_free_resources
    await worker.deinit()
AttributeError: 'MicroserviceRegisterWorker' object has no attribute 'deinit'

To fix this issue will be necessary to implement the async deinit method, which is calling by the sanic-amqp-extension

[Relrin]

Fixed in PR #6