[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 04b729d [NFCI][SimplifyCFG] Guard common code hoisting with a (default-on) flag
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   04b729d..256aea8  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 256aea816da45bd3bc52317cbc89e704095a8991.
CMake Error at CMakeLists.txt:6 (message):
  Your CMake version is 3.7.1.  The minimum version of CMake required to
  build LLVM is now 3.13.4.


-- Configuring incomplete, errors occurred!