The ornamental design for a diningtable, as shown and described.
FIG. 1 is a perspective view of a dining table according to an embodiment of the invention, the perspective view from the opposite side being identical thereto.
FIG. 2 is an end view of a dining table according to an embodiment of the invention.
FIG. 3 is a top view of a dining table according to an embodiment of the invention; and,
FIG. 4 is a side view of a dining table according to an embodiment of the invention.