WIP Yaml support (get rid of json)

[davidemoro]

Rif #5

[codecov-io]

Codecov Report

Merging #63 into features will increase coverage by 0.65%.
The diff coverage is 84.31%.

@@             Coverage Diff              @@
##           features      #63      +/-   ##
============================================
+ Coverage     91.29%   91.95%   +0.65%     
============================================
  Files             7        7              
  Lines           425      410      -15     
============================================
- Hits            388      377      -11     
+ Misses           37       33       -4

Impacted Files	Coverage Δ
pytest_play/engine.py	97.14% <100%> (+1.68%)	⬆️
pytest_play/providers/include.py	100% <100%> (ø)	⬆️
pytest_play/plugin.py	71.15% <79.48%> (-0.78%)	⬇️

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