Use UWS with Polka under the hood
I was reading [here](https://github.com/lukeed/polka/blob/master/examples/with-uws) and looking at the [example](https://github.com/lukeed/polka/blob/master/examples/with-uws/index.js), and it looks like using UWS instead of node's native http can double performance.  Could this be implemented under the hood? 