The ornamental design for the robotic lawnmower, as shown and described.
FIG. 1 is a perspective view of a robotic lawnmower in accordance with an embodiment of the present invention;
FIG. 2 is a top side view of the robotic lawnmower of FIG. 1;
FIG. 3 is a bottom view of the robotic lawnmower of FIG. 1;
FIG. 4 is a left side view of the robotic lawnmower of FIG. 1;
FIG. 5 is a right side view of the robotic lawnmower of FIG. 1;
FIG. 6 is a rear view of the robotic lawnmower of FIG. 1; and,
FIG. 7 is a front view of the robotic lawnmower of FIG. 1.
The broken lines of the robotic lawnmower in FIGS. 1-7 are illustrative of the visible environmental structure of the robotic lawnmower and form no part of the claimed design.