[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 2f5f5fe AMDGPU/GlobalISel: Select llvm.amdgcn.groupstaticsize
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   2f5f5fe..011bf4f  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 011bf4fd9679c8a7dd7e3a6fc9a696e417ce3c53.
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!