Remove unused imports.

src/host.rs

@@ -7,7 +7,7 @@
 // except according to those terms.
 
 use std::cmp;
-use std::fmt::{self, Formatter, Write};
+use std::fmt::{self, Formatter};
 use std::io;
 use std::net::{Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6, ToSocketAddrs};
 use std::vec;

src/percent_encoding.rs

@@ -9,7 +9,7 @@
 use encoding;
 use std::ascii::AsciiExt;
 use std::borrow::Cow;
-use std::fmt::{self, Write};
+use std::fmt;
 use std::slice;
 use std::str;