Get rid of create_spec shortcut

[p1c2u]

No description provided.

[codecov]

Codecov Report

Merging #393 (cd92f42) into master (5e9af67) will decrease coverage by 0.55%.
The diff coverage is 95.65%.

@@            Coverage Diff             @@
##           master     #393      +/-   ##
==========================================
- Coverage   95.80%   95.25%   -0.56%     
==========================================
  Files          82       83       +1     
  Lines        1859     1874      +15     
  Branches      278      280       +2     
==========================================
+ Hits         1781     1785       +4     
- Misses         57       68      +11     
  Partials       21       21              

Impacted Files	Coverage Δ
openapi_core/shortcuts.py	100.00% <ø> (ø)
openapi_core/spec/paths.py	95.23% <93.75%> (-4.77%)	⬇️
openapi_core/__init__.py	100.00% <100.00%> (ø)
openapi_core/spec/__init__.py	100.00% <100.00%> (ø)
openapi_core/templating/paths/util.py	100.00% <100.00%> (ø)
openapi_core/spec/shortcuts.py	0.00% <0.00%> (-90.91%)	⬇️

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