README.md: update to remove "not yet release" remarks on clang-tidy #4008
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clang v18 was released, see
https://github.com/llvm/llvm-project/releases/tag/llvmorg-18.1.6 so let's drop the remarks of "not yet released", and encourage user to the latest stable release of clang-tidy.