[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 0139c8a [CFGuard] Add address-taken IAT tables and delay-load support
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   0139c8a..2b9a708  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 2b9a708491b3533c14db8bb9b43fd61c0ba4e1e1.
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!