raising minimum cmake version number as 2.8 is deprecated

[andreagilardoni]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.39%. Comparing base (501271b) to head (c408cc0).
Report is 19 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #537   +/-   ##
=======================================
  Coverage   95.39%   95.39%           
=======================================
  Files          33       33           
  Lines        1521     1521           
=======================================
  Hits         1451     1451           
  Misses         70       70           

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