[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at a825eaa [lldb] [Platform] Move common ::DebugProcess() to PlatformPOSIX
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   a825eaa..d8ee28b  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to d8ee28b96ee77a466aea5e9ca9c6ed57b2194b4d.
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!