[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 0ccf926 [ASAN] Make sure we are only processing lifetime markers with offset 0 to alloca
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   0ccf926..3f2386d  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 3f2386de6325157324a0dc2ae00ef3db3a144563.
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!