I claim the ornamental design for a swing, substantially shown and described herein.
FIG. 1 is a top perspective view of the swing according to the new design;
FIG. 2 is a left side elevational view thereof;
FIG. 3 is a right side elevational view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines showing portions of the swing are included for the purpose of illustrating portions of the article and form no part of the claimed design.