The ornamental design for a dishrack, as shown and described.
FIG. 1 is a left side perspective view of a dishrack showing our new design;
FIG. 2 is a rear view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
FIG. 8 is a left side perspective view of a second embodiment of a dishrack showing our new design, wherein the stippling in the drawing indicates areas of contrasting appearance;
FIG. 9 is a rear view thereof;
FIG. 10 is a front view thereof;
FIG. 11 is a left side view thereof;
FIG. 12 is a right side view thereof;
FIG. 13 is a top plan view thereof; and,
FIG. 14 is a bottom plan view thereof.
The broken lines shown in the drawings represent portions of the dishrack that form no part of the claimed design.