[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at b922004 [RelocationResolver] Support R_PPC_REL32 & R_PPC64_REL{32,64}
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   b922004..3073a3a  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 3073a3aa1ef1ce8c9cac9b97a8e5905dd8779e16.
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!