webob support

[gjo]

webob (used by pyramid) 's multidict protocol does not have getlist method, use getall instead of getlist.

[codecov]

Codecov Report

Merging #173 into master will decrease coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #173     +/-   ##
=========================================
- Coverage   96.72%   96.62%   -0.1%     
=========================================
  Files          71       71             
  Lines        1770     1721     -49     
=========================================
- Hits         1712     1663     -49     
  Misses         58       58

Impacted Files	Coverage Δ
openapi_core/schema/schemas/_format.py	89.7% <0%> (-1.21%)	⬇️
openapi_core/contrib/flask/requests.py	91.66% <0%> (-0.65%)	⬇️
openapi_core/schema/links/generators.py	92% <0%> (-0.6%)	⬇️
openapi_core/schema/parameters/enums.py	93.75% <0%> (-0.37%)	⬇️
openapi_core/schema/schemas/exceptions.py	87.27% <0%> (-0.23%)	⬇️
openapi_core/schema/parameters/models.py	97.22% <0%> (-0.12%)	⬇️
openapi_core/schema/specs/models.py	95.45% <0%> (-0.11%)	⬇️
openapi_core/schema/schemas/models.py	95.28% <0%> (-0.03%)	⬇️
openapi_core/schema/responses/generators.py	100% <0%> (ø)	⬆️
openapi_core/contrib/django/responses.py	100% <0%> (ø)	⬆️
... and 13 more

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[gjo]

thx!