[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 642b21b [AArch64] Enable RAS 1.1 system registers in all AArch64
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   642b21b..f7eac51  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to f7eac51b9b3f780c96ca41913293851c5acb465b.
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!