RUSTSEC-2020-0117 QueueSender<T>/QueueReceiver<T>: Send/Sync impls need `T: Send`

Affected versions of this crate unconditionally implemented Send/Sync for QueueSender, allowing to send non-Send T to other threads by invoking &QueueSender.send. This fails to prevent users from creating data races by sending types like Rc or Arc to other threads, which can lead to memory...