HTTP headers should be case-insensetive

[cherepets]

No description provided.

[codecov]

Codecov Report

Merging #6 into master will increase coverage by 0.32%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master       #6      +/-   ##
==========================================
+ Coverage   47.11%   47.43%   +0.32%     
==========================================
  Files          17       17              
  Lines         641      643       +2     
  Branches       55       55              
==========================================
+ Hits          302      305       +3     
  Misses        327      327              
+ Partials       12       11       -1

Impacted Files	Coverage Δ
...rc/NETStandard.HttpListener/HttpListenerHeaders.cs	58.62% <66.66%> (+1.47%)	⬆️
...c/NETStandard.HttpListener/HttpListenerResponse.cs	56.94% <0%> (+1.38%)	⬆️

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