The ornamental design for a beverageholder, as shown and described.
FIG. 1 is a perspective view of a beverage holder showing my new design;
FIG. 2 is a front view of my new design illustrated in FIG. 1; the rear view of my new design is the mirror image of the front view;
FIG. 3 is a top view thereof; and,
FIG. 4 is a bottom view thereof.
The broken line showing in FIG. 4 of the bottom of the beverage holder is included for the purpose of illustrating portions of the Beverage Holder and forms no part of the claimed design.