Using Tiberius with named pipes

[pimeys]

Mio 0.7 has support for Windows named pipes. The author of mysql_async (blackbeam) is having a PR open to Tokio to support them in the runtime.

I wrote a small example, trying them out with Tiberius, and they actually work!

When the support lands to Tokio, we should update our documentation to reflect these changes.

#132

[janpio]

Named pipes were merged to tokio via tokio-rs/tokio#3760