The ornamental design of a connector, as shown and described.
FIG. 1 is a front elevation view of a connector showing my design;
FIG. 2 is a rear elevation view thereof;
FIG. 3 is a right side elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a perspective view thereof.
The broken line portion of the figure drawings is included to show unclaimed subject matter only and forms no part of the claimed design. The special dot-dash broken line defines the boundary of the claimed design and forms no part of the claimed design.