Nits: just some mini-spelling error

[sebastianmika]

Just that - a little misspelling

[codecov]

Codecov Report

Merging #6 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #6   +/-   ##
=======================================
  Coverage   56.70%   56.70%           
=======================================
  Files           5        5           
  Lines         164      164           
=======================================
  Hits           93       93           
  Misses         71       71           

Impacted Files	Coverage Δ
openapi_schema_validator/_validators.py	33.89% <ø> (ø)

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