Allow head requests to work for routes with no other method

[Owlbertz]

Hi,
I noticed that having are route with only a HEAD request defined leads to it being filtered out here.
Adding head to the list of methods seems to fix this issue.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (f31a751) to head (83e3b71).
Report is 3 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop      #741   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           28        28           
  Lines          190       190           
=========================================
  Hits           190       190           

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