The ornamental design for a bottleopener, as shown and described.
FIG. 1 is a perspective view of a bottle opener, showing our new design.
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a front elevation view thereof;
FIG. 6 is a left side elevation view thereof, shown at an enlarged scale; and,
FIG. 7 is a right side elevation view thereof, shown at an enlarged scale.
The double dot-dashed broken lines show a corkscrew, a knife, a bottle cap opener, and interior gripping elements, none of which form a part of the claimed design.