[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 8a8a2dd [lldb/Utility] Simplify Scalar handling of float types
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   8a8a2dd..ed8982d  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to ed8982da3e3122ffe2de8801d6ca1e1bd1e3c10a.
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!