incorrect cmake version in readme

[sekomer]

project readme states that you require cmake version >= 3.5 but that version does not exist, and 3.2 is used in your project

[sekomer]

pr 👇🏻 https://github.com/NilFoundation/zkLLVM/pull/567

[uginf0urth]

@sekomer what is wrong with 3.5 version? https://cmake.org/cmake/help/latest/release/3.5.html