Consider deprecating in favour of http-terminator

[gajus]

I have answered a variation of "how to terminate a HTTP server" many times on different Node.js support channels. Unfortunately, I couldn't recommend any of the existing libraries because they are lacking in one or another way (https://github.com/gajus/http-terminator#alternative-libraries). I have since put together a package that (I believe) is handling all the cases expected of graceful HTTP termination.

https://github.com/gajus/http-terminator

I would appreciate if you consider contributing to http-terminator and deprecating http-shutdown.