[www-scripts] Clang Attribute Doc Update: ERROR

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UPDATING LLVM SOURCES
HEAD is now at 1ce07cd Instantiate Error in Target::GetEntryPointAddress() only when necessary
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   1ce07cd..cfc76d2  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to cfc76d2bce436dc82cedf7d8719d7493923d5762.
CMake Error at CMakeLists.txt:3 (cmake_minimum_required):
  CMake 3.13.4 or higher is required.  You are running version 3.7.1


-- Configuring incomplete, errors occurred!