Added support for the REPORT method

[kolaente]

This pr adds support for the http REPORT method specified in RFC 3253.

[codecov]

Codecov Report

Merging #1332 into master will increase coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1332      +/-   ##
==========================================
+ Coverage   84.34%   84.37%   +0.03%     
==========================================
  Files          27       27              
  Lines        2012     2016       +4     
==========================================
+ Hits         1697     1701       +4     
  Misses        205      205              
  Partials      110      110

Impacted Files	Coverage Δ
echo.go	85.62% <ø> (ø)	⬆️
router.go	95.33% <100%> (+0.07%)	⬆️

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[kolaente]

Thanks for merging!