Add comment to N-queens test

[odow]

Closes #84

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.40%. Comparing base (5e9241b) to head (ddfe238).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #85   +/-   ##
=======================================
  Coverage   98.40%   98.40%           
=======================================
  Files           3        3           
  Lines         500      500           
=======================================
  Hits          492      492           
  Misses          8        8           

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