fixed imports & changelog

Author: Ma124

CHANGELOG.md

@@ -1,6 +1,6 @@
 # `linya` Changelog
 
-## 0.3.0 (2022-03-08)
+## Unreleased
 
 #### Added
 

examples/multi.rs

@@ -1,7 +1,6 @@
 use linya::{Bar, Progress};
 use rand::Rng;
 use rayon::prelude::*;
-use std::fmt::Write;
 use std::sync::Mutex;
 use std::time::Duration;