Beverage Container Cap

FIG. 1 is a first bottom isometric view of a beverage container cap showing the new design; FIG. 2 is a second bottom isometric view thereof; FIG. 3 is a third isometric view thereof; FIG. 4 is a fourth isometric view thereof; FIG. 5 is a bottom plan view thereof; FIG. 6 is a top isometric view thereof; and, FIG. 7 is a side elevation view thereof. The shading lines shown in the drawings represent the three-dimensional contour of the claimed design and are not intended to indicate surface decoration. The dashed lines shown in drawings illustrate portions of the beverage container cap that form no part of the claimed design. The dash-dot lines indicate the boundaries of the claimed design that form no part thereof.