[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 2062b370 [LAA] Avoid adding pointers to the checks if they are not needed.
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   2062b370..4c16eaf master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 4c16eafe12a5f0c82303511d9d3d7acb5ffe84e4.
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!