[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 62f89a8 [Hexagon] Add assertions about V6_pred_scalar2
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   62f89a8..9128f5c  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 9128f5c8a719095f12a8864a2b81395c70a321b3.
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!