We claim the ornamental design for a holder, as shown and described.
FIG. 1 is a front view of an embodiment the claimed design;
FIG. 2 is a first side view of the design shown in FIG. 1;
FIG. 3 is a second side view of the design shown in FIG. 1;
FIG. 4 is a top view of the design shown in FIG. 1;
FIG. 5 is a front perspective view of another embodiment the claimed design;
FIG. 6 is a front view of the design shown in FIG. 5; and,
FIG. 7 is a side view of the design shown in FIG. 5.
The ornamental design which is claimed is shown in solid lines in the drawings. The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design.