The ornamental design for a green roofmodule, as shown.
FIG. 1 is a front perspective view of a green roof module showing my new design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a right side elevation view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
FIGS. 1-8 show the new design for a green roof module in solid lines with broken lines showing environmental association matter for illustrative purposes only and forming no part of the claimed design.