[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 0353961 Remove unused variable introduce in 0448d11a06b451a causing build
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   0353961..0e47a8d  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 0e47a8d17fe85b4ab810a17cde4178b2729f2363.
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!