minor symfony#14646 Update README.md (94noni)

This PR was merged into the 2.3 branch.

Discussion
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Update README.md

See symfony#14347
@ping @nicolas-grekas

Commits
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ec89cfd Update README.md

Author: fabpot

README.md

@@ -33,8 +33,8 @@ work for you:
 Installation
 ------------
 
-The best way to install Symfony is to download the Symfony Standard Edition
-available at <https://symfony.com/download>.
+The best way to install Symfony is to use the [official Symfony Installer][7].
+It allows you to start a new project based on the version you want.
 
 Documentation
 -------------
@@ -64,3 +64,4 @@ Information on how to run the Symfony test suite can be found in the
 [4]: https://symfony.com/doc/current/contributing/code/patches.html#check-list
 [5]: https://symfony.com/doc/current/contributing/code/patches.html#make-a-pull-request
 [6]: https://symfony.com/doc/master/contributing/code/tests.html
+[7]: https://symfony.com/doc/current/book/installation.html#installing-the-symfony-installer