I claim the ornamental design for a holder, as shown and described.
FIG. 1 is a front perspective view from above of the claimed design including a beverage container as unclaimed background, according to one embodiment;
FIG. 2 is a front perspective view of the claimed design of FIG. 1;
FIG. 3 is a bottom perspective view of the claimed design of FIG. 1;
FIG. 4 is a top view of the claimed design of FIG. 1;
FIG. 5 is a bottom view of the claimed design of FIG. 1;
FIG. 6 is a front view of the claimed design of FIG. 1, wherein the left, right, and rear views are identical to the front view; and,
FIG. 7 is a section view of the claimed design along line 7-7 of FIG. 5.
The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design.