I claim the ornamental design for an auger rack, as shown and described.
FIG. 1 is a perspective view of a auger rack, showing my new design;
FIG. 2 is a left-side elevation view thereof;
FIG. 3 is a right-side elevation view thereof;
FIG. 4 is a front elevation view thereof;
FIG. 5 is a back elevation thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof, showing the auger rack.
The broken lines showing a tractor auger and lifting equipment are included for the purpose of illustrating environmental structure and forms no part of the claimed design.