The ornamental design for a bottlecap, as shown and described.
FIG. 1 is a front perspective view of a bottle cap showing my new design;
FIG. 2 is a side view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a bottom view thereof;
FIG. 5 is a side view thereof shown in a position of use on a bottle drawn in broken lines; and,
FIG. 6 is a side view thereof shown in an alternative closed configuration and in a position of use on a bottle drawn in broken lines.
The broken lines in FIGS. 5 and 6 illustrating a bottle depict environment and form no part of the claimed design. All other broken lines depict portions of the bottle cap that form no part of the claimed design.