The ornamental design for a bottleholder, as shown and described.
FIG. 1 is a perspective view of a bottle holder illustrating my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom elevational side view thereof;
FIG. 4 is a side elevational view thereof,
FIG. 5 is a front elevational view thereof; and,
FIG. 6 is a perspective view of my new design, with a nail polish bottle situated therein.
The broken lines shown in FIGS. 1 and 2 illustrate portions of the article. The broken lines shown in FIG. 6 illustrate environment. None of the broken lines form part of the claimed design.