Update README.md

Update README.md

README.md

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     <img src="https://symfony.com/logos/symfony_black_02.svg">
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-The [Symfony client][1] helps developers [create and manage Symfony applications][2].
+The [Symfony CLI code][1] has been Open-Sourced now, use it instead of the one provided in this repository, which is not maintained anymore.
 
-It provides a [local HTTP/2 web server][3] with [TLS certificates][4].
-It checks for [security vulnerabilities][5].
-It seamlessly integrates with [SymfonyCloud][6].
-Have a look at [@fabpot's SymfonyCon 2018 Keynote][10] for more information.
-
-A must-have tool when developing Symfony apps locally.
-
-Install the client
-------------------
-
-Follow our instructions on [symfony.com][1].
-
-Reporting Issues
-----------------
-
-If you encounter an issue related to SymfonyCloud, please report it on
-[symfony.com][7]. If you encounter another issue, please report it on
-[GitHub][8].
-
-Security Issues
----------------
-
-If you discover a security vulnerability, please follow our [disclosure procedure][9].
-
-[1]: https://symfony.com/download
-[2]: https://symfony.com/download#new
-[3]: https://symfony.com/doc/current/setup/symfony_server.html
-[4]: https://symfony.com/doc/current/setup/symfony_server.html#enabling-tls
-[5]: https://symfony.com/doc/current/security/security_checker.html
-[6]: https://symfony.com/cloud
-[7]: https://symfony.com/cloud/support/new
-[8]: https://github.com/symfony/cli/issues/new
-[9]: https://symfony.com/security
-[10]: https://speakerdeck.com/fabpot/symfony-local-web-server-dot-dot-dot-reloaded
+[1]: https://github.com/symfony-cli/symfony-cli