Changed class namespace in SymfonyDispatcher

[lukasnovot]

Hello,
In commit https://github.com/Kdyby/Events/commit/a1bc9fc91bc69fc09c6887eab4244f5e5103670f#diff-1f0ce9072c0cc99b258ebb3dfed9367aec2b79e2f6a14809e6c04028669190d0R13 changed namespace of class Event alias SymfonyEvent in SymfonyDispatcher.php. @PavelJurasek did you have any reason?
I have problem with migrations via console. ConsoleCommandEvent and ConsoleTerminateEvent extends Symfony\Component\EventDispatcher\Event not Symfony\Contracts\EventDispatche\Event

[PavelJurasek]

Hi, my guess is that you use older versions of sf/console. Upgrading those might be an option.