src/Application.php
protected function registerProviders()
    {
        foreach (array_merge($this->providers, $this['config']->get('providers', [])) as $provider) {
            $this->register(new $provider);
        }
    }
protected function registerProviders()
    {
        foreach (array_merge($this->providers, $this['config']->get('providers', [])) as $provider) {
            $this->register(new $provider);
        }
    }
Register Provider

@return void