code: public WebhookCluster buildWebhooks(Collection<Webhook> webhooks)
      {
          Checks.notNull(webhooks, "Webhooks");
          for (Webhook webhook : webhooks)
          {
              Checks.notNull(webhook, "Webhook");
              buildWebhook(webhook.getIdLong(), webhook.getToken());
          }
          return this;
      }
docs: Creates new {@link net.dv8tion.jda.webhook.WebhookClient WebhookClients} and adds them
  to this cluster.
  <br>The {@link net.dv8tion.jda.webhook.WebhookClientBuilder WebhookClientBuilders}
  will be supplied with the default settings of this cluster.
  
  @param  webhooks
  Webhooks to target (duplicates will not be filtered)
  
  @throws java.lang.IllegalArgumentException
  If the provided collection or any of the contained
  webhooks is {@code null}
  
  @return The current WebhookCluster for chaining convenience
  
  @see    #buildWebhooks(Webhook...)
  @see    #newBuilder(Webhook)