pyyaml strict requirement fix

[p1c2u]

Fixes #402

[codecov]

Codecov Report

Merging #404 (6784356) into stable/0.14.x (50d191a) will decrease coverage by 0.05%.
The diff coverage is n/a.

❗ Current head 6784356 differs from pull request most recent head d8e3cda. Consider uploading reports for the commit d8e3cda to get more accurate results

@@                Coverage Diff                @@
##           stable/0.14.x     #404      +/-   ##
=================================================
- Coverage          96.28%   96.23%   -0.06%     
=================================================
  Files                 80       80              
  Lines               1563     1541      -22     
=================================================
- Hits                1505     1483      -22     
  Misses                58       58              

Impacted Files	Coverage Δ
openapi_core/contrib/falcon/responses.py	90.90% <0.00%> (-0.76%)	⬇️
openapi_core/contrib/flask/requests.py	92.85% <0.00%> (-0.48%)	⬇️
openapi_core/unmarshalling/schemas/util.py	90.32% <0.00%> (-0.31%)	⬇️
openapi_core/casting/schemas/casters.py	96.29% <0.00%> (-0.14%)	⬇️
...penapi_core/unmarshalling/schemas/unmarshallers.py	94.82% <0.00%> (-0.06%)	⬇️
openapi_core/spec/accessors.py	100.00% <0.00%> (ø)
openapi_core/templating/datatypes.py	100.00% <0.00%> (ø)
openapi_core/validation/decorators.py	100.00% <0.00%> (ø)
openapi_core/contrib/flask/handlers.py	100.00% <0.00%> (ø)
openapi_core/contrib/django/requests.py	100.00% <0.00%> (ø)
... and 8 more

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