header.hpp renaming

[cmazakas]

For the sake of reducting ambiguity with regards to tooling, rename src/detail/header.hpp to src/deatil/header_impl.hpp

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.09%. Comparing base (e94906b) to head (39a71bf).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop      #72   +/-   ##
========================================
  Coverage    88.09%   88.09%           
========================================
  Files           78       78           
  Lines         4260     4260           
========================================
  Hits          3753     3753           
  Misses         507      507           

Files	Coverage Δ
src/detail/header_impl.hpp	100.00% <100.00%> (ø)
src/request.cpp	100.00% <ø> (ø)
src/response.cpp	100.00% <ø> (ø)

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[cppalliance-bot]

GCOVR code coverage report https://72.http-proto.prtest.cppalliance.org/gcovr/index.html
LCOV code coverage report https://72.http-proto.prtest.cppalliance.org/genhtml/index.html
Coverage Diff https://72.http-proto.prtest.cppalliance.org/gcovr/coverage_diff.txt

[cppalliance-bot]

GCOVR code coverage report https://72.http-proto.prtest.cppalliance.org/gcovr/index.html
LCOV code coverage report https://72.http-proto.prtest.cppalliance.org/genhtml/index.html
Coverage Diff https://72.http-proto.prtest.cppalliance.org/gcovr/coverage_diff.txt