added change log entry for matplotlib#1504 and matplotlib#1505

Author: tacaswell

CHANGELOG

@@ -21,6 +21,12 @@
            an active colorable artist, such as an image, and just sets
            up the colormap to use from that point forward. - PI
 
+2012-11-16 Added the funcction _get_rbga_face, which is identical to
+           _get_rbg_face except it return a (r,g,b,a) tuble, to line2D.
+           Modified Line2D.draw to use _get_rbga_face to get the markerface
+           color so that any alpha set by  markerfacecolor will respected.
+	   - Thomas Caswell
+
 2012-11-13 Add a symmetric log normalization class to colors.py.
            Also added some tests for the normalization class.
            Till Stensitzki