[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 632a89e [SCCP] Restore the change reporting as well
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   632a89e..bc79ed7  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to bc79ed7e16003c8550da8710b321d6d5d4243faf.
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!