[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 41e68f7 [EarlyCSE] Fix and recommit the revised c9826829d74e637163fdb0351870b8204e62d6e6
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   41e68f7..da92448  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to da9244882804ec6479aac70334fd7f7b4baf855e.
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!