Rc<lsl::StreamInfoHandle> cannot be Send

Hi!

I'm working on an implementation of an inlet as a tokio stream. However, I am stuck on the following error:

```
`Rc<lsl::StreamInfoHandle>` cannot be shared between threads safely
, the trait `Sync` is not implemented for `Rc<lsl::StreamInfoHandle>`
```

which is fixed here https://github.com/labstreaminglayer/liblsl-rust/pull/10.

Any update about the PR?