We claim the ornamental design for a capsule, substantially as shown and described.
FIG. 1 is a perspective view of the top of the capsule;
FIG. 2 is a perspective view of the bottom of the capsule;
FIG. 3 is an elevation view of the front of the capsule;
FIG. 4 is an elevation view of the back of the capsule;
FIG. 5 is an elevation view of the right side of the capsule;
FIG. 6 is an elevation view of the left of the capsule;
FIG. 7 is an elevation view of the top of the capsule;
FIG. 8 is an elevation view of the bottom of the capsule;
FIG. 9 is a close-up perspective view of a portion of the top side of the capsule; and,
FIG. 10 is a close-up perspective view of a portion of the bottom side of the capsule.
The broken lines showing portions of the design in all figures is included for the purpose of illustrating environment and unclaimed features and forms not part of the claimed design.