Update README.md

Hello,

I remove an unused link 😉

Author: abdounikarim

README.md

@@ -57,4 +57,3 @@ $ ./bin/phpunit
 [2]: https://symfony.com/doc/current/reference/requirements.html
 [3]: https://symfony.com/doc/current/cookbook/configuration/web_server_configuration.html
 [4]: https://symfony.com/download
-[5]: https://github.com/symfony/webpack-encore