Changed: add possibility to override authorize function

[treussart]

Merge Request to allow the possibility of being able to override the 'authorize' method.
This allows you to change the business logic on user authentication.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.83%. Comparing base (51bf962) to head (115eb8e).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #25   +/-   ##
=======================================
  Coverage   79.83%   79.83%           
=======================================
  Files           1        1           
  Lines         119      119           
=======================================
  Hits           95       95           
  Misses         13       13           
  Partials       11       11           

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