[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at f054617 [ASTMatchers] Add missing definition for decompositionDecl
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   f054617..4cff1b4  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 4cff1b40dacf6a5489b09657d94ea4757b8cd3b0.
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!