Log Message:
Update to 3.0.15. From Changelog:

- Now depends on :mod:`amqp` 1.4.5.
- RabbitMQ 3.3 changes QoS semantics (Issue #339).

    See the RabbitMQ release notes here:
    http://www.rabbitmq.com/blog/2014/04/02/breaking-things-with-rabbitmq-3-3/

    A new connection property has been added that can be used to detect
    whether the remote server is using this new QoS behavior::

        >>> Connection('amqp://').qos_behavior_matches_spec
        False

    so if your application depends on the old semantics you can
    use this to set the ``apply_global`` flag appropriately::

        def update_prefetch_count(channel, new_value):
            channel.basic_qos(
                0, new_value,
                not channel.connection.client.qos_behavior_matches_spec,
            )
- Users of :mod:`librabbitmq` is encouraged to upgrade to librabbitmq 1.5.0.
    The ``kombu[librabbitmq]`` extra has been updated to depend on this
    version.
- Pools: Now takes transport options into account when comparing connections
  (Issue #333).
- MongoDB: Fixes Python 3 compatibility.
- Async: select: Ignore socket errors when attempting to unregister handles
  from the loop.
- Pidbox: Can now be configured to use a serializer other than json,
  but specifying a serializer argument to :class:`~kombu.pidbox.Mailbox`.
- Message decompression now works with Python 3.