The ornamental design for a platformmodule, as shown and described.
FIG. 1 is a perspective view of a platform module showing my new design;
FIG. 2 is a top plan view of the platform module of FIG. 1;
FIG. 3 is a bottom plan view of the platform module of FIG. 1;
FIG. 4 is a front elevation view of the platform module of FIG. 1;
FIG. 5 is a rear elevation view of the platform module of FIG. 1;
FIG. 6 is a right side elevation view of the platform module of FIG. 1; and,
FIG. 7 is a left side elevation view of tha platform module of FIG. 1.
The broken lines showing the tread pattern in FIGS. 1 through 3 and holes in FIG. 3 are included for the purpose of illustrating portions of the platform module which form no part of the claimed design.