[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 8c36eaf [clang][opencl][codegen] Remove the insertion of `correctly-rounded-divide-sqrt-fp-math` fn-attr.
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   8c36eaf..cb3fd71  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to cb3fd715f324ff0f58dfeb7d08a88a05477cb0d5.
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!