The ornamental design for a rattle, as shown and described.
FIG. 1 is a perspective view of a rattle in accordance with my invention thereof;
FIG. 2 is a front elevational view thereof, the rear elevational view being a mirror image of the front elevational view;
FIG. 3 is a right side elevational view thereof, the left side elevational view being a mirror image except for the rimmed disk surface as shown in FIG. 1;