The ornamental design for a ring, as shown and described.
FIG. 1 is a perspective view of a ring showing my new design;
FIG. 2 is a side view thereof;
FIG. 3 is a side view thereof, from a side opposite that of FIG. 2;
FIG. 4 is a front view thereof;
FIG. 5 is a rear view thereof, from a side opposite that of FIG. 4;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken lines shown in the drawings illustrate portions of the ring that form no part of the claimed design. The air bubble feature of the design at the top of the ring as shown in FIGS. 1-5 is purposely left out of the top view, FIG. 6, for clarity of the disclosure but forms part of the claimed design.