Spec 3.0 schema

[p1c2u]

Based on latest 3.0.x schema

https://github.com/OAI/OpenAPI-Specification/blob/master/schemas/v3.0/

[codecov]

Codecov Report

Merging #110 (152b193) into master (0b869a7) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #110   +/-   ##
=======================================
  Coverage   98.23%   98.23%           
=======================================
  Files          18       18           
  Lines         510      510           
=======================================
  Hits          501      501           
  Misses          9        9           

Impacted Files	Coverage Δ
openapi_spec_validator/__init__.py	100.00% <100.00%> (ø)

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