[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 08c1a0d [mlir][CAPI] Proposal: Always building a libMLIRPublicAPI.so (re-apply).
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   08c1a0d..32d239a  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 32d239a75882ece768b431a3ea44b4dba7070551.
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!