[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 4ec7f7e [flang][openacc] Lower init and shutdown directive
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   4ec7f7e..96b0b9a  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 96b0b9a5e3c2a038c8590b2d71fa6cc03dc96aa4.
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!