The ornamental design for a beveragecontainer, as shown and described.
FIG. 1 is an upper perspective view of a beverage container;
FIG. 2 is a second upper perspective view of the beverage container;
FIG. 3 is a third upper perspective view of the beverage container;
FIG. 4 is a front view of the beverage container;
FIG. 5 is a rear view of the beverage container;
FIG. 6 is a right side view of the beverage container;
FIG. 7 is a left side view of the beverage container;
FIG. 8 is a top view of the beverage container; and,
FIG. 9 is a bottom view of the beverage container;
The broken lines showing in the figures are included for the purpose of illustrating portions of the beverage container that form no part of the claimed design. The dash-dot lines showing in the figures are included for defining the bounds of the claimed design that form no part thereof.