Maknz\Slack\Client::setDefaultUsername PHP Method

    public function setDefaultUsername($username)
    {
        $this->username = $username;
    }

 /**
  * @param \Maknz\Slack\Client $client
  * @param Repository          $config
  */
 public function __construct(Client $client, Repository $config)
 {
     $this->config = $config->get('server-monitor.notifications.slack');
     $client->setDefaultUsername($this->config['username']);
     $client->setDefaultIcon($this->config['icon']);
     $this->client = $client;
 }