Adds polyline support to README

README.textile

@@ -54,6 +54,10 @@ Not yet included in this gem, but you can do it with nokogiri to parse the XML t
 <pre>GoogleDirections.new(origin, destination).xml</pre>
 And then nokogiri can cycle through each <step> and you can pick out what you need.
 
+h3. Polylines support
+
+If you need the polylines for the route, you can call `directions.polylines` (where `directions` is an instance of `GoogleDirections`. Further, if you'd rather have those polylines (aka, the route) as a series of points instead, call `directions.polylines_as_points`.
+
 h2. License
 
 Anyone can use this code in any way.