Compatibility with CMake < 3.5 has been removed from CMake

[tategotoazarasi]

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CMake Error at CMakeLists.txt:1 (cmake_minimum_required):
  Compatibility with CMake < 3.5 has been removed from CMake.

  Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
  to tell CMake that the project requires at least <min> but has been updated
  to work with policies introduced by <max> or earlier.

  Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.

[markuz]

This PR solves it

[sveitser]

@FedeDP the build for libmodule is currently failing on NixOS due to this. Could you merge the PR mentioned above?

https://hydra.nixos.org/build/307983955/nixlog/3

[FedeDP]

Fixed by #21. Sorry for the long time no see :( i am very busy. Also, i'd need to backport the fix and make a 5.0.2 release. I'll try to do that asap!

[FedeDP]

Released 5.0.2 with the cmake fix! https://github.com/FedeDP/libmodule/releases/tag/5.0.2

Thanks for the patience :)