The ornamental design for a beveragecontainer, as shown and described.
FIG. l is a perspective view of a beverage container which embodies the present design; only the front view of the beverage container is shown because the back view is identical;
FIG. 2 is a front view of the beverage container of FIG. 1;
FIG. 3 is a left side view of the beverage container of FIG. 1;
FIG. 4 is a right side view of the beverage container of FIG. 1;
FIG. 5 is a top view of the beverage container of FIG. 1; and,
FIG. 6 is a bottom view of the beverage container of FIG. 1.