The ornamental design for a snowshovel, as shown and described.
FIG. 1 is a top right front perspective view of a snow shovel showing my new design;
FIG. 2 is a bottom right front perspective view thereof;
FIG. 3 is a bottom left back perspective view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a back view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a right view thereof; and,
FIG. 9 is a left view thereof.
The broken line showing of the grooves in FIGS. 1, 2, 4, and 6, and the broken line showing of the support connector in FIGS. 1, 2, 4, and 6, are included for the purpose of showing environmental structure and form no part of the claimed design.