refactor(http1): fix redundant imports

src/proto/h1/io.rs

@@ -168,7 +168,6 @@ where
     }
 
     pub fn read_from_io(&mut self) -> Poll<usize, io::Error> {
-        use bytes::BufMut;
         self.read_blocked = false;
         let next = self.read_buf_strategy.next();
         if self.read_buf.remaining_mut() < next {

src/proto/h1/role.rs

@@ -511,7 +511,7 @@ impl Http1Transaction for Server {
     }
 
     fn on_error(err: &::Error) -> Option<MessageHead<Self::Outgoing>> {
-        use ::error::{Kind, Parse};
+        use ::error::Kind;
         let status = match *err.kind() {
             Kind::Parse(Parse::Method) |
             Kind::Parse(Parse::Header) |