[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at a85e43e Remove D80713.diff added in 528057c19755ad842052fba3a42dcbf7deafc6de
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   a85e43e..34cd06a  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 34cd06a9b3bddaa7a989c606bbf1327ee651711c.
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!