[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at e37b220 [gn build] (manually) hack around 70f8d0ac8a3
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   e37b220..5e5bda7  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 5e5bda74b61b3e8a4434abe2b5fe5d7ac5880ccd.
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!