[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 1692611 [lldb] Only set the executable module for a target once
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   1692611..1b7c9ea  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 1b7c9eae6dcad09c264e29e41a69bed0d34c2f5f.
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!