Upgrade to rust 2018

Author: jabedude

Cargo.toml

@@ -7,6 +7,7 @@ license = "MIT/Apache-2.0"
 repository = "https://github.com/jabedude/acct"
 documentation = "https://docs.rs/acct/0.6.0/acct/"
 keywords = ["acct", "unix", "process", "accounting", "pacct"]
+edition = "2018"
 
 [lib]
 name = "acct"

src/bin.rs

@@ -1,7 +1,3 @@
-extern crate acct;
-extern crate chrono;
-extern crate clap;
-
 use acct::AcctFile;
 use chrono::prelude::DateTime;
 use chrono::Utc;

src/lib.rs

@@ -6,8 +6,8 @@
 
 #[macro_use]
 extern crate serde_derive;
-extern crate bincode;
-extern crate libc;
+use bincode;
+
 
 use bincode::{deserialize, serialize};
 use libc::{getpwuid, passwd};
@@ -57,7 +57,7 @@ impl From<std::boxed::Box<bincode::ErrorKind>> for Error {
 }
 
 impl fmt::Display for Error {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match *self {
             Error::InvalidFile => write!(f, "Invalid file"),
             Error::BadReader => write!(f, "Invalid reader"),