slog-gelf - A GELF integration for slog-rs

How to use

```rust

[macro_use]

extern crate slog; extern crate hostname; extern crate slogasync; extern crate sloggelf;

use slog::Drain;

fn main() { let hostname = hostname::get_hostname().unwrap();

let drain = slog_gelf::Gelf::new(&hostname, "192.168.0.1011:12201")
    .unwrap()
    .fuse();
let drain = slog_async::Async::new(drain).build().fuse();
let log = slog::Logger::root(drain, o!("key" => "value"));

info!(log,
    "An example log message";
    "k1" => "v1",
    "k2" => "v2",
);

}

```