Fixed query for retrieving list of sprints

Please see GHS-9747 and GHS-9321

src/main/java/net/rcarz/jiraclient/greenhopper/RapidView.java

@@ -135,7 +135,7 @@ public class RapidView extends GreenHopperResource {
 
         try {
             System.out.println(getId());
-            result = restclient.get(RESOURCE_URI + "sprints/" + id);
+            result = restclient.get(RESOURCE_URI + "sprintquery/" + id);
         } catch (Exception ex) {
             throw new JiraException("Failed to retrieve sprints", ex);
         }