@NotNull
  public Notification notifyInfo(@NonNls @Nullable String displayId,
                                 @NotificationTitle @NotNull String title,
                                 @NotificationContent @NotNull String message) {
    return notifyInfo(displayId, title, message, null);
  }
@NotNull
  public Notification notifyInfo(@NonNls @Nullable String displayId,
                                 @NotificationTitle @NotNull String title,
                                 @NotificationContent @NotNull String message)