The ornamental design for a connector, as shown and described.
FIG. 1 is a front elevational view of a connector showing my new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a right side elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a perspective view from a top side thereof; and,
FIG. 8 is a perspective view from a bottom side thereof.
The dashed broken line showing of the connector is for the purpose of illustrating portions of the article and forms no part of the claimed design, and the dot-dash broken line defines the bound of the claimed design and form no part thereof.