We claim the ornamental design for a cap, as shown and described.
FIG. 1 is an upper perspective view of the cap;
FIG. 2 is a front plan view of the cap shown in FIG. 1;
FIG. 3 is a rear plan view of the cap shown in FIG. 1;
FIG. 4 is a left side view of the cap shown in FIG. 1;
FIG. 5 is a right side view of the cap shown in FIG. 1;
FIG. 6 is a top plan view of the cap shown in FIG. 1;
FIG. 7 is a bottom plan view of the cap shown in FIG. 1; and,
FIG. 8 is a lower perspective view of the cap shown in FIG. 1.
The dashed broken line showing of the cap illustrates the environment of the claimed design and forms no part thereof. The dashed break lines indicate that any portion of the article beyond what is shown forms no part of the claimed design. The long-dash short-dash broken lines indicate boundary lines of the claim and forms no part of the claimed design.