메일 전송 기능 삭제. 나중에 필요하면 다시 추가하기로.

vendor/composer/autoload_psr4.php

@@ -8,7 +8,6 @@ $baseDir = dirname($vendorDir);
 return array(
     'Psr\\Log\\' => array($vendorDir . '/psr/log/Psr/Log'),
     'Psr\\Http\\Message\\' => array($vendorDir . '/psr/http-message/src'),
-    'PHPMailer\\PHPMailer\\' => array($vendorDir . '/phpmailer/phpmailer/src'),
     'Monolog\\' => array($vendorDir . '/monolog/monolog/src/Monolog'),
     'League\\Plates\\' => array($vendorDir . '/league/plates/src'),
     'Leafo\\ScssPhp\\' => array($vendorDir . '/leafo/scssphp/src'),