[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 849c605 PR47792: Include the type of a pointer or reference non-type template
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   849c605..4b01190  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 4b011901229c9c6397651a03e16c5f5b98a8412c.
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!