update readme

Author: lkeegan

Diff for: README.md

@@ -4,6 +4,6 @@
 
 Get the latest versions here:
 
-- linux (clang 17 / Ubuntu 20.04): [sme_deps_llvm_linux.tgz](https://github.com/spatial-model-editor/sme_deps_llvm/releases/latest/download/sme_deps_llvm_linux.tgz)
+- linux (clang 18 / Ubuntu 20.04): [sme_deps_llvm_linux.tgz](https://github.com/spatial-model-editor/sme_deps_llvm/releases/latest/download/sme_deps_llvm_linux.tgz)
 - osx (Xcode 14.3 / macOS 13): [sme_deps_llvm_osx.tgz](https://github.com/spatial-model-editor/sme_deps_llvm/releases/latest/download/sme_deps_llvm_osx.tgz)
 - win64-mingw (mingw-w64-x86_64-gcc 13): [sme_deps_llvm_win64-mingw.tgz](https://github.com/spatial-model-editor/sme_deps_llvm/releases/latest/download/sme_deps_llvm_win64-mingw.tgz)