use aur4 by default

prm

@@ -7,8 +7,8 @@ _self="${0##*/}"
 
 cfg_workdir="$PWD"
 
-# Version 3 by default. For now
+# Version 4 by default.
-cfg_aur_version='3'
+cfg_aur_version='4'
 
 err() { printf "$@" >&2; }