[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 0b90a08 [test][DebugInfo] Adapt two tests for Sun assembler syntax on Sparc
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   0b90a08..3853730  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 38537307e502c1ac9a09e6f75f9208db1327a0bf.
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!