Channels-rabbitmq

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* Fix race when sending to group. [issue 23]

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* Support Python 3.8 (upgrade to aioamqp=0.14.0) [issue 20] [PR 21]
* Deprecate ``group_expiry`` [issue 18] [PR 19]. Rationale:
https://github.com/django/channels/issues/1371

Users who previously configured a ``group_expiry`` should remove it. It will
produce a deprecation warning, and it will be disallowed starting in v2.0.0.

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* Allow asgiref=3.2.1. [issue 15]

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* Avoid race which could drop messages and hang publish(). [issue 14]

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* Warn when back-pressuring. Back-pressuring can make a web server
unresponsive, even though it's behaving according to spec.
* Expire messages after receiving them from RabbitMQ but before
``receive()``. Warn when expiring. Allows recovery after messages
are sent to nonexistent channels.

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* Make ``groups_exchange`` configurable [issue 12]