The ornamental design for a cap, as shown and described.
FIG. 1 is a perspective view of a cap according to my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof; and
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a perspective view of the cap according to my new design.
The broken lines that are adjacent to the edge of the visor and that cross the inner and outer surfaces of the crown, the single line at the central bottom edge of the crown, as well as the single broken line on the inside margins of the crown in FIG. 3 are stitching and form a part of the claimed design, the rounded shape in broken lines shown in FIG. 8 illustrates environmental matter and forms no part of the claimed design.