Removed default from attachments field for earlier versions of mysql

Author: rickdegraaf-dq

database/migrations/2017_12_14_151421_add_attachments_to_emails_table.php

@@ -18,7 +18,7 @@ public function up()
         }
 
         Schema::table('emails', function (Blueprint $table) {
-            $table->binary('attachments')->after('body')->default('');
+            $table->binary('attachments')->after('body');
         });
     }