The ornamental design for a package, as shown and described.
FIG. 1 is a front view of a package in a folded condition showing my new design;
FIG. 2 is a rear view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is bottom view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof; and,
FIG. 7 is a front perspective view thereof.
The broken lines showing of environmental structure or surface treatment (writing or logos, etc.) are for illustrative purposes only and forms no part of the claimed design.