The ornamental design for a shoestrap, as shown and described.
FIG. 1 is a perspective view of a shoe strap, showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a right side elevational view thereof; and,
FIG. 7 is a left side elevational view thereof.
The tightly-spaced lines shown on the front and rear of the design illustrate hook-and-loop textures on the front and rear surfaces and are not intended to indicate two-dimensional surface patterns.