fix：respond example convert

[Hufe921]

remove convertExample function call when schema type is object and json

[codecov]

Codecov Report

Merging #18 (a5439d6) into master (ffc0305) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master      #18   +/-   ##
=======================================
  Coverage   75.04%   75.04%           
=======================================
  Files          19       19           
  Lines         549      549           
  Branches      135      135           
=======================================
  Hits          412      412           
  Misses        126      126           
  Partials       11       11           

Impacted Files	Coverage Δ
packages/swagger/src/lib/createAPI.ts	57.60% <0.00%> (ø)

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Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.04%. Comparing base (ffc0305) to head (a5439d6).
⚠️ Report is 17 commits behind head on master.

Files with missing lines	Patch %	Lines
packages/swagger/src/lib/createAPI.ts	0.00%	2 Missing ⚠️
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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #18   +/-   ##
=======================================
  Coverage   75.04%   75.04%           
=======================================
  Files          19       19           
  Lines         549      549           
  Branches      135      135           
=======================================
  Hits          412      412           
  Misses        126      126           
  Partials       11       11           

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