Implement support for server hot reload

[opensaucerer]

When changes get made to a barf server, the only current way to get those changes reflecting at the listening port is to quit the server and restart it.

While this might not seem like a stressful one at first, over time is starts to become tiring and the idea of the server having to hot reload itself begins to make a lot more sense.

It's like nodemon but for Barf.

[Oluwaseun241]

@opensaucerer
https://github.com/cosmtrek/air this might help

[opensaucerer]

Thank you for sharing. I think @ShowBaba is already working on this issue.

[xlassix]

It seems he is done #22