[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 27da287 [flang][NFC] Fix CMake variable name in README.md
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   27da287..a90d721  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to a90d72127a814ea242227456be711aca07cc83a6.
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!