Update to Rust 2018

Author: danieldk

Cargo.toml

@@ -2,6 +2,7 @@
 name = "finalfrontier-python"
 version = "0.1.0"
 authors = ["Daniël de Kok <[email protected]>"]
+edition = "2018"
 
 [lib]
 name = "finalfrontier"

src/lib.rs

@@ -1,10 +1,5 @@
 #![feature(specialization)]
 
-extern crate failure;
-extern crate finalfrontier;
-extern crate ndarray;
-extern crate pyo3;
-
 use std::fs::File;
 use std::io::BufReader;
 use std::rc::Rc;