Follow 3xx redirects

[drwpow]

This PR adds 3xx redirect following, which was previously unsupported.

Also fixes an unreleased contentType bug from #508.

[codecov]

Codecov Report

Merging #510 (e335198) into main (fc0152b) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #510      +/-   ##
==========================================
- Coverage   84.66%   84.61%   -0.05%     
==========================================
  Files           9        9              
  Lines         313      312       -1     
  Branches       98       98              
==========================================
- Hits          265      264       -1     
  Misses         45       45              
  Partials        3        3              

Impacted Files	Coverage Δ
src/index.ts	75.00% <ø> (-1.48%)	⬇️
src/transform/headers.ts	30.00% <ø> (ø)
src/transform/index.ts	56.60% <ø> (ø)
src/transform/operation.ts	96.42% <ø> (ø)
src/transform/parameters.ts	100.00% <ø> (ø)
src/transform/paths.ts	91.66% <ø> (ø)
src/transform/responses.ts	86.84% <ø> (ø)
src/utils.ts	90.56% <ø> (ø)

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