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The bulk of the changes are related to how the library entities are now
interconnected. In previous versions of `aio_pika.Channel` instances not
contains a link to the `aio_pika.Connection` instances for now is contains it.
While I don't want custom code to work directly with the `aiormq.Channel`
instance, this was a public API and I should warn you about the change here.
The `aio_pika.Channel.channel` property is deprecated. Use
`aio_pika.Channel.get_underlay_chanel()` instead.
Now all library entities already use this method.