annotate should number lines starting with 1

C programmers are well used to counting from zero, but every
other text file tool starts counting from 1.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

git-annotate.perl

@@ -128,7 +128,7 @@ ()
 	}
 
 	printf("%s\t(%10s\t%10s\t%d)%s\n", $rev, $committer,
-		format_date($date), $i++, $output);
+		format_date($date), ++$i, $output);
 }
 
 sub init_claim {