Removed unused constant. (#49)

Author: Kevin Hellemun

src/test/java/com/bunq/sdk/model/generated/object/NotificationUrlTest.java

@@ -72,9 +72,6 @@ public class NotificationUrlTest extends BunqSdkTestBase {
   private static final String JSON_PATH_SHARE_INVITE_BANK_RESPONSE_MODEL = BASE_PATH_JSON_MODEL +
       "/ShareInviteBankResponse.json";
 
-  private static final Type TYPE_NOTIFICATION_URL = new TypeToken<NotificationUrl>() {
-  }.getType();
-
   private void executeNotificationUrlTest(
       String expectedJsonFileName,
       String classNameExpected,