I claim the ornamental design for a holder, as shown and described.
FIG. 1 is a top, front, left perspective view of the claimed design;
FIG. 2 is a front view of the claimed design of FIG. 1;
FIG. 3 is a rear view of the claimed design of FIG. 1;
FIG. 4 is a left view of the claimed design of FIG. 1;
FIG. 5 is a right view of the claimed design of FIG. 1;
FIG. 6 is a top view of the claimed design of FIG. 1;
FIG. 7 is a bottom view of the claimed design of FIG. 1;
FIG. 8 is a section view of the claimed design along line 8-8 of FIG. 6;
FIG. 9 is a section view of the claimed design along line 9-9 of FIG. 6; and,
FIG. 10 is a section view of the claimed design along line 10-10 of FIG. 6.
The broken lines immediately adjacent the shaded areas represent the bounds of the claimed design while all other broken lines are included for the purpose of illustrating portions of the holder; the broken lines form no part of the claimed design.