[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 7ba3293 [StackColoring] Conservatively merge catch point of V for catch(V)
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   7ba3293..06926e0  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 06926e0f012cbfb2e05c3ab4b9db6b0d057b6d0d.
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!