Perf to be faster

[kperreau]

Hello, don't know if you already know it but there is a faster implementation of net/http called fasthttp and i wonder if there is any plan to release with this package.

Fasthttp (10x faster than net/http):
https://github.com/valyala/fasthttp#http-client-comparison-with-nethttp

Fasthttp with http2 (4x faster):
https://github.com/dgrr/http2

Thanks!

[ColeTownsend]

@kperreau did you end up doing anything with fasthttp?