[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 7a932f4 [Parser] ParseMicrosoftAsmStatement - Replace bit '|' operator with logical '||' operator. (PR47071)
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   7a932f4..348d85a  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 348d85a6c7950a5f14ee6c8741380b5876d99afd.
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!