readOnly and writeOnly on jsonschema4 fix

[p1c2u]

Fixes #40

[codecov]

Codecov Report

Merging #41 (e3f59bf) into stable/0.2.x (92d952f) will increase coverage by 1.70%.
The diff coverage is 100.00%.

@@               Coverage Diff                @@
##           stable/0.2.x      #41      +/-   ##
================================================
+ Coverage         66.03%   67.74%   +1.70%     
================================================
  Files                 6        6              
  Lines               212      217       +5     
  Branches             44       44              
================================================
+ Hits                140      147       +7     
+ Misses               57       53       -4     
- Partials             15       17       +2     

Impacted Files	Coverage Δ
openapi_schema_validator/validators.py	95.45% <100.00%> (+1.33%)	⬆️
openapi_schema_validator/_validators.py	64.44% <0.00%> (+2.22%)	⬆️

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