code: public WebhookCluster buildWebhook(long id, String token)
      {
          this.webhooks.add(newBuilder(id, token).build());
          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  id
  The id for the webhook
  @param  token
  The token for the webhook
  
  @throws java.lang.IllegalArgumentException
  If the provided webhooks token is {@code null} or contains whitespace
  
  @return The current WebhookCluster for chaining convenience
  
  @see    #newBuilder(long, String)