The ornamental design for a connector, as shown and described.
FIG. 1 is a perspective view of a connector showing my new design;
FIG. 2 is another perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof;
FIG. 8 is a bottom view thereof; and,
FIG. 9 is a perspective view thereof in a state of use.
The dashed broken lines in the drawings illustrate portions of the connector and form no part of the claimed design. The dashed broken line showing of the chair in FIG. 9 illustrates the environmental structure of the claimed design and forms no part thereof.