[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at d2d7a44 [flang][msvc] Avoid templated initializer list initialization of vector. NFC.
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   d2d7a44..3681be87 master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 3681be876fea9b270c7a1d2dc41679a399610e06.
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!