The ornamental design for a beverageholder, as shown and described.
FIG. 1 is a perspective view of my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is an end view thereof; and,
FIG. 7 is another end view thereof.
The broken lines showing portions of a support stand, a logo plate, and mounting elements for securing the logo plate to the beverage holder depict environment and form no part of the claim.