[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 30a0dbb [X86] Remove x86_sse42_crc32_64_64 from X86TTIImpl::simplifyDemandedUseBitsIntrinsic
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   30a0dbb..ad48367  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to ad48367722b23dd373e612c1c53b16290ae10194.
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!