1.4.2 (2017-10-26)
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* Fix KeyError for empty groups


1.4.1 (2017-08-11)
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* Fix empty shared memory area bug


1.4.0 (2017-05-24)
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* The message storage backend has been overhauled to lock and serialize less,
  improving performance considerably and removing all double-receive bugs.
  Throughput on even a low-powered laptop should be in the thousands of messages
  per second.

1.3.1 (2017-04-02)
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* Error with sending to multi-process channels with the same message fixed

1.3.0 (2017-04-01)
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* Updated to new process-specific channel style
