[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at e3d646c [Attributor][NFC] applying update_test_checks with --check-attributes
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   e3d646c..04b729d  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 04b729d076af038c2a86b62c0c150e340bf7a622.
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!