Use a date range for the license copyright

[Baptouuuu]

Closes #15

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.59%. Comparing base (b795786) to head (1298d9b).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop      #16   +/-   ##
==========================================
  Coverage      97.59%   97.59%           
  Complexity       375      375           
==========================================
  Files             38       38           
  Lines           2160     2160           
==========================================
  Hits            2108     2108           
  Misses            52       52           

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