[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at b89059a Revert "The wrong placement of add pass with optimizations led to -funique-internal-linkage-names being disabled."
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   b89059a..89c1e35  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 89c1e35f3c5060c23f9eed409f89c2c9908b87ed.
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!