Merge branch '5.4' into 6.0

* 5.4:
  [HttpClient] fix
  [HttpClient] Handle requests with null body
  [WebProfilerBundle] Log section minor fixes (missing "notice" filter, log priority, accessibility)
  Fix link not present

Author: nicolas-grekas

README.md

@@ -17,3 +17,5 @@ Resources
    in the [main Symfony repository](https://github.com/symfony/symfony)
  * [Docker images with intl support](https://hub.docker.com/r/jakzal/php-intl)
    (for the Intl component development)
+
+[0]: https://php.net/intl.setup