Expose writer deadline as part of the ResponseWriter interface

[tigerwill90]

This is small PR that expose SetReadDeadline and SetWriteDeadline as part of the fox.ResponseWriter interface.

This method are intended to control the server WriteTimeout and ReadTimeout on a per handler basis.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.22%. Comparing base (9172015) to head (32df433).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #39      +/-   ##
==========================================
+ Coverage   88.55%   89.22%   +0.66%     
==========================================
  Files          16       16              
  Lines        2080     2088       +8     
==========================================
+ Hits         1842     1863      +21     
+ Misses        182      171      -11     
+ Partials       56       54       -2     

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[pawndev]

LGTM, cool feature !