[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at d025df3 [lsan] Disable some LSAN tests for arm-linux-gnueabi{hf}
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   d025df3..be0578f  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to be0578f0b44dfe6a3c3715a1c77b6ee9b6b65d3f.
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!