[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 142d0d3 [OPENMP]Fix PR46824: Global declare target pointer cannot be accessed in target region.
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   142d0d3..4e6176f  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 4e6176fd912a68de0764fff43a129a73f5cab800.
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!