News item for scales fix

Author: hadley

NEWS

@@ -28,4 +28,6 @@ ggplot2 0.8.5 (2009-XX-XX) ----------------------------------------
   default scales are only added to the plot until just prior to plotting, 
   instead of the previous behaviour where scales where added as layers were
   added - this could cause problems if you layer modified the plot.
-  (Implements #28)
+  (Implements #28)
+* scale_shape_discrete and scale_size_continuous added to scales to match 
+  naming convention of all other scales (Fixes #47)