Support celery-4.4.4

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[codecov-commenter]

Codecov Report

Merging #72 into master will increase coverage by 0.37%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master      #72      +/-   ##
==========================================
+ Coverage   92.85%   93.22%   +0.37%     
==========================================
  Files          22       22              
  Lines        1637     1639       +2     
==========================================
+ Hits         1520     1528       +8     
+ Misses        117      111       -6     

Flag	Coverage Δ
#unittests	93.22% <85.71%> (+0.37%)	⬆️

Impacted Files	Coverage Δ
celery_rpc/runtests/settings.py	100.00% <ø> (ø)
celery_rpc/tests/test_client.py	99.00% <80.00%> (+0.01%)	⬆️
celery_rpc/tasks.py	89.60% <100.00%> (-0.73%)	⬇️
celery_rpc/codecs.py	65.85% <0.00%> (+8.53%)	⬆️

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