The ornamental design for an automobile, as shown and described.
FIG. 1 is a front left perspective view of an automobile showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof; and,
FIG. 6 is a top plan view thereof.
The bottom view of the automobile is not visible during ordinary use and forms no part of the claimed design. The portions depicted in broken lines are environment and the elements depicted in broken lines form no part of the claimed design.