Use the native PHP session handler by default (#209)

symfony/framework-bundle/3.3/config/packages/framework.yaml

@@ -6,8 +6,8 @@ framework:
     #trusted_hosts: ~
     # https://symfony.com/doc/current/reference/configuration/framework.html#handler-id
     #session:
-    #    handler_id: session.handler.native_file
-    #    save_path: '%kernel.project_dir%/var/sessions/%kernel.environment%'
+    #    # The native PHP session handler will be used
+    #    handler_id: ~
     #esi: ~
     #fragments: ~
     php_errors: