[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 03bd519 [OldPM] Pass manager: run SROA after (simple) loop unrolling
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   03bd519..1113fbf  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 1113fbf44c2250621548e278d2a1e11ab2b2d63d.
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!