Patched the Symfony UploadedFile class

Hello,

Here's a patch for the `Symfony\Component\HttpFoundation\File\UploadedFile` class that has 2 required arguments (whereas `SplFileInfo` has one).
It's a quick POC, so unmergeable for now.

Just wanted to gather your though about pathching 3rd party library class (which could potentially open the pandora box!).

Cheers!