Change pdf url format

coin/billing/urls.py

@@ -4,5 +4,5 @@ from coin.billing import views
 
 urlpatterns = patterns(
     '',
-    url(r'^invoice/(?P<id>.+)/pdf$', views.invoice_pdf, name="invoice_pdf")
+    url(r'^invoice/(?P<id>.+).pdf$', views.invoice_pdf, name="invoice_pdf")
 )