[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at d2385f6 [lld][ELF][test] Expand testing of symbols in mergeable sections
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   d2385f6..feed5a7  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to feed5a7239d8ed0ec9f90775080ce8546bf364df.
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!