Closes #1

[tumb1er]

This PR implements new broker-side backoff mechanics that is covered with tests

[codecov-commenter]

Codecov Report

Merging #8 into master will increase coverage by 7.58%.
The diff coverage is 94.38%.

@@            Coverage Diff             @@
##           master       #8      +/-   ##
==========================================
+ Coverage   86.48%   94.06%   +7.58%     
==========================================
  Files           4        8       +4     
  Lines         185      489     +304     
==========================================
+ Hits          160      460     +300     
- Misses         25       29       +4     

Flag	Coverage Δ
#unittests	94.06% <94.38%> (+7.58%)	⬆️

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Impacted Files	Coverage Δ
amqp_events/config.py	80.00% <ø> (ø)
demo/tasks.py	83.33% <90.00%> (ø)
demo/tests.py	93.66% <91.81%> (-6.34%)	⬇️
amqp_events/celery.py	99.17% <99.15%> (ø)
amqp_events/task.py	100.00% <100.00%> (ø)
demo/celery.py	100.00% <100.00%> (ø)
demo/events.py	58.33% <0.00%> (ø)
... and 2 more

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[ttyS15]

👍

Could you move #1 (comment) into README or just refer to it. This comment describes the concept clearly.