Add an env_logger dependency

Author: alexcrichton

cargo-fix/Cargo.toml

@@ -17,6 +17,7 @@ failure = "0.1"
 rustfix = { path = "..", version = "0.2" }
 serde_json = "1"
 log = "0.4"
+env_logger = { version = "0.5", default-features = false }
 
 [dev-dependencies]
 difference = "2"

cargo-fix/src/main.rs

@@ -4,6 +4,7 @@ extern crate rustfix;
 extern crate serde_json;
 #[macro_use]
 extern crate log;
+extern crate env_logger;
 
 use std::collections::{HashSet, HashMap};
 use std::env;
@@ -19,6 +20,7 @@ use failure::{Error, ResultExt};
 mod lock;
 
 fn main() {
+    env_logger::init();
     let result = if env::var("__CARGO_FIX_NOW_RUSTC").is_ok() {
         cargo_fix_rustc()
     } else {