[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 3533e0a [ARM] Add patterns for select(p, BinOp(x, y), z) -> BinOpT(x, y,p z)
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   3533e0a..5623da5  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 5623da56d07b2fa434825af0f3e8494afacf3c52.
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!