Ticket #269: Modified return type of Connection.getHistory to be a List of ConnectionHistory implementors.

guacamole-ext/src/main/java/net/sourceforge/guacamole/net/auth/Connection.java

@@ -114,6 +114,6 @@ public interface Connection {
      *                            of this connection, or if permission is
      *                            denied.
      */
-    public List<ConnectionRecord> getHistory() throws GuacamoleException;
+    public List<? extends ConnectionRecord> getHistory() throws GuacamoleException;
             
 }