[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 36750ba [X86][AVX] isHorizontalBinOp - relax lane-crossing limits for AVX1-only targets.
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   36750ba..0a8ac91  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 0a8ac91a084504929b1ef4ec1fee693455bd796d.
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!