Set cmake_minimum_required to 3.5

[PJK]

Fixed #351

Description

What changes and why

Checklist

• I have read followed CONTRIBUTING.md
  • I have added tests
  • I have updated the documentation
  • I have updated the CHANGELOG
• Are there any breaking changes?
  • If yes: I have marked them in the CHANGELOG (example)
• Does this PR introduce any platform specific code?
• Security: Does this PR potentially affect security?
• Performance: Does this PR potentially affect performance?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.57%. Comparing base (54a3623) to head (1183292).
Report is 28 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #355   +/-   ##
=======================================
  Coverage   98.57%   98.57%           
=======================================
  Files          20       20           
  Lines        1684     1684           
=======================================
  Hits         1660     1660           
  Misses         24       24           

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