[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at eb10b06 [clang] Pass the NamedDecl* instead of the DeclarationName into many diagnostics.
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   eb10b06..3a2b05f  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 3a2b05f9fe74fcf9560632cf2695058d47d8683b.
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!