[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at ee068aa [llvm-readelf] - Do not treat SHT_ANDROID_RELR sections the same as SHT_RELR.
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   ee068aa..eb10b06  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to eb10b065f2a870b425dcc2040b9955e0eee464b4.
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!