FIG. 1 is a perspective view of a shower handle showing a new design; FIG. 2 is a front view thereof; FIG. 3 is a back view thereof; FIG. 4 is a top view thereof; FIG. 5 is a bottom view thereof; and, FIG. 6 is a left side view thereof; the right side view being a mirror image. The broken lines in the Figures are for illustrative purposes only and form no part of the claimed design.