[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 6527712 [mlir][Type] Remove the remaining usages of Type::getKind in preparation for its removal
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   6527712..449b4d2  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 449b4d2a8b2ad1ae9555338a810a8fb74158d16b.
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!