CMake deprecation warning `Compatibility with CMake < 3.5 will be removed from a future version of CMake`

[chapman39]

CMAKE_MINIMUM_REQUIRED(VERSION 3.5) should be increased (say, to 3.14). This will resolve the following warning:

  Compatibility with CMake < 3.5 will be removed from a future version of
  CMake.

  Update the VERSION argument <min> value or use a ...<max> suffix to tell
  CMake that the project does not need compatibility with older versions.