Default config files

In an effort to make upgrading the constantly changing config files
easier, Shift defaulted them and merged your true customizations -
where ENV variables may not be used.

config/broadcasting.php

@@ -36,7 +36,7 @@ return [
             'secret' => env('PUSHER_APP_SECRET'),
             'app_id' => env('PUSHER_APP_ID'),
             'options' => [
-                'host' => env('PUSHER_HOST') === true ?: 'api-' . env('PUSHER_APP_CLUSTER', 'mt1') . '.pusher.com',
+                'host' => env('PUSHER_HOST') ?: 'api-'.env('PUSHER_APP_CLUSTER', 'mt1').'.pusher.com',
                 'port' => env('PUSHER_PORT', 443),
                 'scheme' => env('PUSHER_SCHEME', 'https'),
                 'encrypted' => true,