The ornamental design for a swatchholder, as shown and described.
FIG. 1 is a first perspective view of one embodiment of the swatch holder.
FIG. 2 is a second perspective view of the swatch holder illustrated in FIG. 1.
FIG. 3 is a left side view of the swatch holder illustrated in FIG. 1.
FIG. 4 is a right side view of the swatch holder illustrated in FIG. 1.
FIG. 5 is a front view of the swatch holder illustrated in FIG. 1.
FIG. 6 is a back view of the swatch holder illustrated in FIG. 1.
FIG. 7 is a top view of the swatch holder illustrated in FIG. 1; and,
FIG. 8 is a bottom view of the swatch holder illustrated in FIG. 1.
The dashed lines in FIG. 1 illustrating a shelf, screws and a swatch are directed to environment and are for illustrative purposes only while all other dashed lines in FIGS. 1-8 represent the bounds of the claimed design and form no part of the claimed design for the swatch holder.