Update configuration for valid email access token

Author: hebertcisco

src/config.php

@@ -1,7 +1,7 @@
 <?php
 
 return [
-    'access_token' => env('USE_VALID_EMAIL_TOKEN'),
+    'access_token' => env('USE_VALID_EMAIL_ACCESS_TOKEN'),
     'api_endpoint' => 'https://api.usevalid.email/v1/',
     'timeout' => 10,
 ];