Windows performance hint (#270)

docker-compose.override.yml

@@ -6,9 +6,10 @@ services:
     volumes:
       - ./:/srv/app
       - ./docker/php/conf.d/symfony.dev.ini:/usr/local/etc/php/conf.d/symfony.ini
-      # If you develop on Mac you can remove the var/ directory from the bind-mount
+      # If you develop on Mac or Windows you can remove the var/ and vendor/ directories 
-      # for better performance by enabling the next line
+      #  from the bind-mount for better performance by enabling the next 2 lines
       # - /srv/app/var
+      # - /srv/app/vendor
     environment:
       APP_ENV: dev