We claim the ornamental design for a connector, as shown and described.
FIG. 1 is a top perspective view of a connector showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a first side view thereof, the second side view being a mirror image thereof;
FIG. 4 is a top thereof;
FIG. 5 is a bottom view thereof; and,
FIG. 6 is a cross-section view taken along the line 6-6 of FIG. 2.
The broken line in the figure drawings is included for the purpose of illustrating environment and forms no part of the claimed design. The dash-dot line represents the boundary of the claimed design.