[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at d0d43b5 [OpenMP] target nested `use_device_ptr() if()` and is_device_ptr trigger asserts
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   d0d43b5..cc3bf27  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to cc3bf270776bc362e4a504a2f1bc3c8c932111ea.
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!