[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 7f717b6 [lldb] Fix "no matching std::pair constructor" on Ubuntu 16.04 (NFC)
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   7f717b6..d370836  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to d370836c20c58c9092efbd1b2ee9002ab500af55.
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!