[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at fbfd831 [lldb] Fix relative imports and set the appropriate include dirs
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   fbfd831..b28e3db  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to b28e3db88d053b94250562f837758dc8a92a0a0f.
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!