small tweaks

Author: AhmadWaleed

config/mailmerge.php

@@ -1,7 +1,6 @@
 <?php
 return [
     'services' => [
-        'default' => env('DEFAULT_SERVICE', 'mailgun'),
         'mailgun' => [
             'api_key' => env('MAILGUN_API_KEY'),
             'api_domain' => env('MAILGUN_API_DOMAIN'),

src/helpers.php

@@ -12,8 +12,6 @@
 
 function get_mail_client($service = null): MailClient
 {
-    $service = $service ?: config('mailmerge.services.default');
-
     switch ($service) {
         case 'mailgun':
             return MailgunClientFactory::make();