fix: correct content-type for Postman API export

[tangcent]

fix #1143

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.715%. Comparing base (a6fd903) to head (d1dc141).
Report is 1 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff               @@
##              master     #1144       +/-   ##
===============================================
- Coverage     62.733%   62.715%   -0.018%     
+ Complexity      2372      2369        -3     
===============================================
  Files            254       255        +1     
  Lines          12314     12308        -6     
  Branches        3027      3026        -1     
===============================================
- Hits            7725      7719        -6     
  Misses          3008      3008               
  Partials        1581      1581               

Flag	Coverage Δ
unittests	62.715% <100.000%> (-0.018%)	⬇️

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Files	Coverage Δ
...c/main/kotlin/com/itangcent/http/RawContentType.kt	100.000% <100.000%> (ø)
...ugin/api/export/postman/DefaultPostmanApiHelper.kt	69.262% <100.000%> (ø)
...ea/plugin/api/export/postman/PostmanApiExporter.kt	32.432% <ø> (ø)

... and 1 file with indirect coverage changes

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