[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at de885f1 [InstCombine] Add (icmp ne A, 0) | (icmp ne B, 0) --> (icmp ne (A|B), 0) vector support
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   de885f1..7d8c19a  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 7d8c19a4e9ed8f39eda0f0f383d5ff8f1485471b.
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!