[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 12a281d [gn] Remove unneeded MC dep from llvm-tblgen
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   12a281d..528554c  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 528554c39b098e2d9a9c7ec51c77717aa07db2a2.
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!