The ornamental design for a beerdispenser, as shown and described.
FIG. 1 is a front right perspective view of a beer dispenser showing our new design;
FIG. 2 is a rear right perspective view thereof;
FIG. 3 is a front side view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a rear side view thereof;
FIG. 6 is a left side view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The portions shown in broken lines are for illustrative purposes only, and form no part of the claimed design. In general, bold lines define outer edges of forms while fine lines define contours on surfaces.