Upgrade to rust 2018

Cargo.toml

@@ -2,6 +2,7 @@
 name = "mars"
 version = "0.1.0"
 authors = ["Thomas Forgione <thomas@forgione.fr>"]
+edition = "2018"
 
 [dependencies]
 dirs = "1.0.4"

src/lib.rs

@@ -1,7 +1,3 @@
-extern crate dirs;
-extern crate notify_rust;
-extern crate hyper;
-
 use std::io;
 use std::process::{Command, ExitStatus};
 use std::path::PathBuf;

src/server.rs

@@ -18,7 +18,6 @@ use mars::{GeneralBuilder, builder_arguments_from_string};
 
 fn main() {
 
-
     let (tx, rx) = mpsc::channel();
 
     let tasks = Arc::new(Mutex::new(vec![]));