use no_delay on the TcpStream

[whyCPPgofast]

Hi,

https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.set_nodelay

This is basically a default for most modern http clients since it reduces latency of sending bytes.

I was going through the stream.rs file but I'm not sure how to implement it and make a pull request so I decided to open this issue sorry about that.

[jsha]

Some references:

curl sets nodelay by default
reqwest sets nodelay by default
Go sets nodelay by default on all TCP connectiosn

I'm in favor of implementing. Let's build it on top of #389