The ornamental design for a bottleholder, as shown and described.
FIG. 1 is a perspective view of the bottle holder;
FIG. 2 is a front view of the bottle holder of FIG. 1;
FIG. 3 is a rear view of the bottle holder of FIG. 1;
FIG. 4 is a top view of the bottle holder FIG. 1;
FIG. 5 is a bottom view of the bottle holder of FIG. 1;
FIG. 6 is a side view of the bottle holder of FIG. 1, the opposite side view being a mirror image thereof, with a shorter bottle in phantom shown resting in the holder; and,
FIG. 7 is a second side view of the bottle holder of FIG. 1, the opposite side view being a mirror image thereof, with a taller bottle in phantom shown resting in the holder.
The broken lines are for illustrative purposes only and form no part of the claimed design.