The ornamental design for a badge, as shown and described.
FIG. 1 is a front plan view showing the happy face orientation of the
button face;
FIG. 2 is a top plan view of the button with the bottom plan view being the
same, the broken line showing of a fastening pin is for illustrative
purposes only and forms no part of the claimed design; and,
FIG. 3 is a front plan view showing the sad face orientation of the button
face.
The opposite side view to FIG. 1 is plain and unornamented.