Less warnings

src/main.rs

@@ -5,10 +5,10 @@ extern crate systemstat;
 use std::thread;
 use termion::{cursor, color, clear, terminal_size};
 use termion::color::Color;
-use termion::raw::{IntoRawMode, RawTerminal};
+use termion::raw::{IntoRawMode};
 use termion::screen::{AlternateScreen};
 use termion::async_stdin;
-use std::io::{Read, Write, StdoutLock, stdout};
+use std::io::{Read, Write, stdout};
 use std::time::{Duration, Instant};
 use std::cmp::min;