The ornamental design for an automobile, as shown and described.
FIG. 1 is a front left perspective view of an automobile showing our new design;
FIG. 2 is a rear left perspective view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a rear view thereof.
The claimed design is indicated by the relatively dark portions in the figures, while the relatively light portions form no part of the claimed design.