[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at e7b4fee [Format/ObjC] Add NS_SWIFT_NAME() and CF_SWIFT_NAME() to WhitespaceSensitiveMacros
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   e7b4fee..8b6d1c0  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 8b6d1c0467b2dfa14cb2d2dec7637bf95c78364b.
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!