The ornamental design for a towelhanger, as shown and described.
FIG. 1 is a perspective view of a towel hanger embodying my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a right side view thereof; and,
FIG. 7 is an enlarged sectional view along 7—7 thereof.
The broken-line disclosure is understood to represent a portion of the article in which the claimed design is embodied, but which forms no part of the claimed design.