[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at d4f3903 [libTooling] Provide overloads of `rewriteDescendants` that operate directly on an AST node.
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   d4f3903..711b980  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 711b9806547b0392ff636499cebfb73f72d4c595.
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!