Edx-event-bus-redis

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Added
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* Use utility from openedx_events to reset application state before processing
event

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Added
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* Adds custom exceptions for producing and consuming errors.

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Added
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* Option to limit length of stream.

Changed
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* Updated README.

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Changed
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* **BREAKING CHANGE**: Removed deprecated ``signal`` argument from consumer.

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Changed
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* Deprecated ``signal`` argument in consumer (made optional in preparation for removal)

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Added
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* Option to claim messages from other consumers based on idle time.

Changed
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* Setting ``check_backlog`` will read messages that were not read by this consumer group.