Update to rust 2018 edition

Author: kpcyrd

Cargo.toml

@@ -9,6 +9,7 @@ keywords = ["config", "configuration", "settings", "env", "environment"]
 authors = ["Ryan Leckey <[email protected]>"]
 categories = ["config"]
 license = "MIT/Apache-2.0"
+edition = "2018"
 
 [badges]
 maintenance = { status = "actively-developed" }

examples/glob/Cargo.toml

@@ -1,6 +1,7 @@
 [package]
 name = "glob"
 version = "0.1.0"
+edition = "2018"
 
 [dependencies]
 config = { path = "../../" }

examples/glob/src/main.rs

@@ -1,6 +1,3 @@
-extern crate glob;
-extern crate config;
-
 use std::path::Path;
 use std::collections::HashMap;
 use config::*;

examples/global/Cargo.toml

@@ -1,6 +1,7 @@
 [package]
 name = "global"
 version = "0.1.0"
+edition = "2018"
 
 [dependencies]
 config = { path = "../../" }

examples/hierarchical-env/Cargo.toml

@@ -1,6 +1,7 @@
 [package]
 name = "hierarchical-env"
 version = "0.1.0"
+edition = "2018"
 
 [dependencies]
 config = { path = "../../" }

examples/hierarchical-env/src/settings.rs

@@ -38,7 +38,7 @@ pub struct Settings {
 
 impl Settings {
     pub fn new() -> Result<Self, ConfigError> {
-        let mut s = Config::new();
+        let mut s = Config::default();
 
         // Start off by merging in the "default" configuration file
         s.merge(File::with_name("config/default"))?;

examples/simple/Cargo.toml

@@ -1,6 +1,7 @@
 [package]
 name = "simple"
 version = "0.1.0"
+edition = "2018"
 
 [dependencies]
 config = { path = "../../" }

examples/simple/src/main.rs

@@ -1,5 +1,3 @@
-extern crate config;
-
 use std::collections::HashMap;
 
 fn main() {

examples/watch/Cargo.toml

@@ -1,6 +1,7 @@
 [package]
 name = "watch"
 version = "0.1.0"
+edition = "2018"
 
 [dependencies]
 config = { path = "../../" }

examples/watch/src/main.rs

@@ -1,17 +1,11 @@
-extern crate config;
-extern crate notify;
-
-#[macro_use]
-extern crate lazy_static;
-
 use config::*;
 use std::collections::HashMap;
 use std::sync::RwLock;
 use notify::{RecommendedWatcher, DebouncedEvent, Watcher, RecursiveMode};
 use std::sync::mpsc::channel;
 use std::time::Duration;
 
-lazy_static! {
+lazy_static::lazy_static! {
     static ref SETTINGS: RwLock<Config> = RwLock::new({
         let mut settings = Config::default();
         settings.merge(File::with_name("Settings.toml")).unwrap();