[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 674f578 [gardening] Replace some uses of setDebugLoc(DebugLoc()) with dropLocation(), NFC
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   674f578..1d54e75  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 1d54e75cf26a4c60b66659d5d9c62f4bb9452b03.
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!