Changed the location of the Symfony installer.

[SketchNI]

curl -LsS didn't follow the 301 redirect and just downloaded the response into /usr/bin/local/symfony.
Using https://get.symfony.com/symfony.phar downloaded the actual installer.

[stof]

the -L option of curl is precisely telling it to follow redirects, so this is weird.

[SketchNI]

Well, this is embarrassing. I actually typed
[sketch@numinex: /srv]$ sudo curl -lSs https://symfony.com/installer -o /usr/bin/local/symfony

I must have hit caps lock. I'll close this PR if the change isn't suitable regardless of my error.

[javiereguiluz]

@SketchNI I'm glad this works now for you.

I'm afraid I need to close this issue as "won't fix". Even if this would work, there's no guarantee that it'll work in the future. We could change the name or the location of the .phar file and that's why we use the /installer shortcut.