Sort subdirs for more intuitive behavior

dotfiles/git-universe/bin/sibling

 then
     sibling=$(cat $sibling_conf);
 else
-    sibling=$(find -maxdepth 1 -type d -name "[^.]*" | head -1)
+    sibling=$(find -maxdepth 1 -type d -name "[^.]*" | sort | head -1)
 fi
 
 if [ -z "$sibling" ];