I claim the ornamental design for a poncho, as shown and described.
FIG. 1 is a perspective front view of the poncho showing my new design;
FIG. 2 is a front view of the poncho;
FIG. 3 is a rear view of the poncho;
FIG. 4 is a left-side view of the poncho;
FIG. 5 is a right-side view of the poncho;
FIG. 6 is a top view of the poncho;
FIG. 7 is a bottom view of the poncho;
FIG. 8 is a perspective front view of the open poncho in use; and,
FIG. 9 is a perspective front view of the closed poncho in use.
The stitching illustrated in broken lines shown in the drawings form part of the claimed design. The person wearing the poncho in FIGS. 8 and 9 shown in broken lines depict environment and from no part of the claimed design.