The ornamental design for a runningshoe, as shown and described.
FIG. 1 is a front, top perspective view of a running shoe showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left side elevational view thereof; and,
FIG. 5 is a right side elevational view thereof.
The dashed dot lines on the top flap of the shoe in FIGS. 1, 2, 4, and 5 of the sneaker represent thread stitching. The portions of the shoe shown in even broken lines form no part of the claimed design.