fix: ignore proxy headers `content-md5` and `content-type`

[codecov-commenter]

Codecov Report

Merging #107 into dev will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #107   +/-   ##
=======================================
  Coverage   90.90%   90.90%           
=======================================
  Files           1        1           
  Lines          55       55           
  Branches       30       30           
=======================================
  Hits           50       50           
  Misses          5        5           

Impacted Files	Coverage Δ
lib/module.js	90.90% <ø> (ø)

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[pi0]

Thanks