The ornamental design for a brochureholder, as shown and described.
FIG. 1 is a perspective view of a brochure holder;
FIG. 2 is a top view of the brochure holder;
FIG. 3 is a bottom view of a brochure holder;
FIG. 4 is a front view of the brochure holder;
FIG. 5 is a rear view of the brochure holder;
FIG. 6 is a right side view of the brochure holder; and,
FIG. 7 is a left side view of the brochure holder.
The broken lines showing surfaces of the brochure holder in FIGS. 1, 3, 5, 6, and 7 are included for the purpose of illustrating portions that form no part of the claimed design.