Python2 compatibility module

[p1c2u]

Added changes to #59

[codecov]

Codecov Report

Merging #69 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #69      +/-   ##
==========================================
+ Coverage   98.61%   98.64%   +0.02%     
==========================================
  Files          52       53       +1     
  Lines        1086     1105      +19     
==========================================
+ Hits         1071     1090      +19     
  Misses         15       15

Impacted Files	Coverage Δ
openapi_core/__init__.py	100% <ø> (ø)	⬆️
openapi_core/schema/schemas/factories.py	100% <100%> (ø)	⬆️
openapi_core/schema/schemas/util.py	100% <100%> (ø)	⬆️
openapi_core/schema/parameters/generators.py	100% <100%> (ø)	⬆️
openapi_core/validation/util.py	100% <100%> (ø)	⬆️
openapi_core/schema/operations/generators.py	97.36% <100%> (ø)	⬆️
openapi_core/schema/schemas/models.py	96.03% <100%> (ø)	⬆️
openapi_core/schema/specs/factories.py	100% <100%> (ø)	⬆️
openapi_core/schema/specs/models.py	94.59% <100%> (ø)	⬆️
openapi_core/compat.py	100% <100%> (ø)
... and 6 more

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