property missing reference fix

[p1c2u]

Fixes #183

[codecov]

Codecov Report

Merging #191 (a379748) into master (602ec11) will increase coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #191      +/-   ##
==========================================
+ Coverage   92.38%   92.47%   +0.08%     
==========================================
  Files          13       13              
  Lines         420      425       +5     
  Branches       61       63       +2     
==========================================
+ Hits          388      393       +5     
  Misses         22       22              
  Partials       10       10              

Impacted Files	Coverage Δ
openapi_spec_validator/validation/validators.py	91.89% <100.00%> (+0.22%)	⬆️

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