[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at bd93f5c [yaml2obj] - Add a way to override sh_type section field.
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   bd93f5c..984cf99  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 984cf99055a292b3afe4535c013d38914a3da880.
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!