The ornamental design for a markercap, as shown and described.
FIG. 1 is a top, right perspective view of a marker cap showing the new design;
FIG. 2 is a top, left perspective view thereof;
FIG. 3 is a front elevational view thereof, the rear elevational view being a mirror image;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The evenly spaced broken lines in the drawings represent unclaimed portions of the marker cap and are included to show portions that form no part of the claimed design.
The long and short broken lines in the drawings define the bounds of the claimed design form no part thereof.