Cleaning up after tests (removing all those .out files)

t/run.t

@@ -107,3 +107,8 @@ eval {
   }
 };
 ok(!$@, "modify some header fields ($@)");
+
+### clean temporary files
+unlink('t/3.out');
+unlink('t/4.out');
+unlink('t/5.out');