We claim the ornamental design for a beverage dispenser, as shown and described.
FIG. 1 is a top perspective view of a beverage dispenser;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a right side view thereof,
FIG. 4 is a rear elevational view thereof,
FIG. 5 is a left side view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The ornamental design which is claimed is shown in solid lines in the drawings. The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design.