The ornamental design for a stepcover, as shown and described.
FIG. 1 is a top and front perspective view of my new ornamental design for a step cover;
FIG. 2 is an enlarged left-side view, and right-side mirror image, of the step cover shown in FIG. 1;
FIG. 3 is a top view of the step cover shown in FIG. 1;
FIG. 4 is a bottom view of the step cover shown in FIG. 1;
FIG. 5 is an enlarged front view of the step cover shown in FIG. 1;
FIG. 6 is an enlarged rear view of the step cover shown in FIG. 1; and,
FIG. 7 is a detailed view of the portion of the step cover circumscribed in FIG. 2.
The dash-dash broken lines in the drawings of the step cover illustrate portions of the step cover that are not claimed. The dash-dot-dot broken lines in the drawings depict unclaimed environment and form no part of the claimed design.