[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at b014cc0 [ORC] Add a LLJITWithThinLTOSummaries example in OrcV2Examples
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   b014cc0..55208f5  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 55208f5a2126e491c41ba9ff6542551bfc090e86.
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!