[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 1c1a810 libclc: Use find_package to find Python 3 and require it
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   1c1a810..e28c589  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to e28c5899a24117cdb0b081a54508af486a2634a0.
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!