[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 8113a8b [lldb/ObjectFileMachO] Fetch shared cache images from our own shared cache
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   8113a8b..ecb2e5b  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to ecb2e5bcd7e616f62a8c61722ee8d4033c78e32e.
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!