The ornamental design for a poncho, as shown and described.
FIG. 1 is a perspective view of the poncho.
FIG. 2 is a front view thereof.
FIG. 3 is a back view thereof.
FIG. 4 is a left side view thereof. The right side view is a mirror image of and identical to the left side view shown in FIG. 4 and is therefore not separately shown.
FIG. 5 is a top view thereof.
FIG. 6 is a close up front view of the poncho being worn by a user; and,
FIG. 7 is a front view of the poncho being worn by a user.
The larger broken lines shown in FIGS. 1-7 are used to define a boundary of the claimed poncho and form no part of the claimed design. The smaller dashed lines shown in FIGS. 6-7 are used to represent the environment and form no part of the claimed design.