Fix styleci issues

Author: hailwood

src/Http/Requests/MailgunRequest.php

@@ -29,6 +29,7 @@ public function email()
     {
         /** @var InboundEmail $modelClass */
         $modelClass = config('mailbox.model');
+
         return $modelClass::fromMessage($this->get('body-mime'));
     }
 

src/Http/Requests/PostmarkRequest.php

@@ -19,6 +19,7 @@ public function email()
     {
         /** @var InboundEmail $modelClass */
         $modelClass = config('mailbox.model');
+
         return $modelClass::fromMessage($this->get('RawEmail'));
     }
 }

src/Http/Requests/SendGridRequest.php

@@ -19,6 +19,7 @@ public function email()
     {
         /** @var InboundEmail $modelClass */
         $modelClass = config('mailbox.model');
+
         return $modelClass::fromMessage($this->get('email'));
     }
 }