Bottle cap

FIG. 1 is a perspective view of a bottle cap in accordance with the present design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a perspective view of the bottle cap in its environment thereof.

The broken lines shown in the drawings illustrate portions of the bottle cap and its environment that form no part of the claimed design.