[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at ef748b5 [lldb] NFC: Use early exit in ArchSpec::IsEqualTo
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   ef748b5..f9fec04  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to f9fec0447e12da9e8cf4b628f6d45f4941e7d182.
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!