Updated readme to remove todos that are done

readme.txt

@@ -15,6 +15,4 @@ VerticalBar(...)
 
 --- Still to do ---
 
--  Factor out default stylesheets so that individual properties may be overridden without copying the entire stylesheet into another app.
 -  Implement javascript-based animation (See JellyGraph for a Silverlight example of what simple animation can do for a charting library).
--  Convert to using element-tree instead of whatever I'm using