[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 7d6c3e5 [test] Fix quadradic-exit-value.ll under NPM
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   7d6c3e5..1913bb6  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 1913bb622cbc735b31ae5d529442c79b5e6fef75.
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!