[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at ab9fc8b [SLC] sprintf(dst, "%s", str) -> strcpy(dst, str)
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   ab9fc8b..b182ccf  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to b182ccfc2d6a59d0fad0685746b48f462ebf6052.
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!