The ornamental design for a connector, as shown and described.
FIG. 1 is a front perspective view of a connector of the present invention, showing the new, original, and ornamental design;
FIG. 2 is a right side view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines shown in the drawings are included for the purpose of illustrating unclaimed portions of the connector and environmental structure, and form no part of the claimed design.