The ornamental design for a bottleopener, as shown.
FIG. 1 is a front perspective view of the bottle opener of the present invention;
FIG. 2 is a front view of the bottle opener of FIG. 1;
FIG. 3 is a back view of the bottle opener of FIG. 1;
FIG. 4 is a side view of the bottle opener of FIG. 1, as seen from the left side of FIG. 2; and
FIG. 5 is a side view of the bottle opener of FIG. 1, as seen from the right side of FIG. 2; and,
FIG. 6 is a top view of the bottle opener of FIG. 1, as seen from the top side of FIG. 2.
The broken lines showing the number eighteen, sleeve stripes and a “V” shape are included for the purpose of showing portions that form no part of the claimed design.