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Silex 2 has been release last year and there was some changes that this library doesn't support.
I don't know if there's a particular reason as why it wasn't updated, but I'm proposing this pull request to update the Silex version to ~2.0.
The ServiceProviderInterface has change namespace in version ~2.0. It's now:
use Pimple\ServiceProviderInterface;
Updated the StatsdServiceProvider to reflect that change