[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 99cd569 [ELF] --wrap: set isUsedInRegularObj of __wrap_ if it is defined or shared
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   99cd569..6cd2355  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 6cd23558d3a9fbe8bc73e96d4df4e52c8261d1b5.
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!