[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 3c6b457 [OPENMP]Fix PR48076: Check map types array before accessing its front.
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   3c6b457..0c80b54  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 0c80b542d38b4819809c600e71a6997a9b4e4294.
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!