Refactor serialization

[codecov-io]

Codecov Report

Merging #14 (adccfc4) into develop (a9c4107) will decrease coverage by 0.01%. The diff coverage is 97.50%.

@@             Coverage Diff             @@
##           develop      #14      +/-   ##
===========================================
- Coverage    88.67%   88.65%   -0.02%     
===========================================
  Files           34       34              
  Lines         1898     1904       +6     
===========================================
+ Hits          1683     1688       +5     
- Misses         215      216       +1     

Flag	Coverage Δ
unittests	88.65% <97.50%> (-0.02%)	:arrow_down:

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Impacted Files	Coverage Δ
amazon_transcribe/client.py	55.55% <50.00%> (+1.85%)	:arrow_up:
amazon_transcribe/serialize.py	97.82% <100.00%> (+0.45%)	:arrow_up:
amazon_transcribe/utils.py	100.00% <100.00%> (ø)
tests/functional/test_serialize.py	100.00% <100.00%> (ø)
amazon_transcribe/request.py	86.60% <0.00%> (-1.79%)	:arrow_down:

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[joguSD]

Looks good. 🚢