[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 417d3d4 [docs] [lit] Add a more helpful description for lit.py's -s flag.
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   417d3d4..0b161de  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 0b161def6cacff1a63d3cf1a1efe95b550814d7a.
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!