updated licensing and added submodules hook

pre-commit/aur-pkgbuild

@@ -1,10 +1,9 @@
 #!/bin/sh
 
-# Copying and distribution of this file, with or without modification, are
-# permitted in any medium without royalty provided the copyright notice and this
-# notice are preserved.  This file is offered as-is, without any warranty.
+# This work is marked with CC0 1.0. To view a copy of this license, visit
+# <http://creativecommons.org/publicdomain/zero/1.0>.
 
-# Hook to generate & add .SRCINFO to AUR PKGBUILD commits.
+# Git hook to generate & add .SRCINFO to AUR PKGBUILD commits.
 
 makepkg --printsrcinfo > .SRCINFO
 git add .SRCINFO