Update brief.md

[caesquerre]

The lighthouse is used in the example code as well in the examples for ORB, BRISK and FREAK

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.39%. Comparing base (bfb819f) to head (fe5518b).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #115      +/-   ##
==========================================
- Coverage   98.40%   98.39%   -0.02%     
==========================================
  Files          11       11              
  Lines         817      748      -69     
==========================================
- Hits          804      736      -68     
+ Misses         13       12       -1     

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