Updated readme example to new API

Author: Jeffrey Haprer

README.markdown

@@ -27,13 +27,13 @@ You can specify the sections you want to pull from the RESTful API.
 <pre><code>
 sections = ('bill_id', 'sponsor', 'committees')
 bill = Bill.get_bill(bill_id='hr3-112', sections=sections)
-print bill['sponsor_id']
+print bill['sponsor']
 </pre></code>
 
 Otherwise, it uses the default that's specified in the library.
 
 <pre><code>
-bill = RTC.Bill.get_bill(bill_id)
+bill = RTC.Bill.get_bill(bill_id='hr3-112')
 print bill['sponsor_id'], bill['vetoed'], bill['last_action']['text']
 </pre></code>