More Rust updates:

- Some stray deriving -> derive changes
- use::{mod} -> use::{self}
- fmt.write -> fmt.write_str

This does not catch the last case of fmt.write_str in the
Show impl of a Header Item. This will need to be changed
separately.

src/header/shared/encoding.rs

@@ -7,7 +7,7 @@ pub use self::Encoding::{Chunked, Gzip, Deflate, Compress, Identity, EncodingExt
 
 /// A value to represent an encoding used in `Transfer-Encoding`
 /// or `Accept-Encoding` header.
-#[deriving(Clone, PartialEq)]
+#[derive(Clone, PartialEq)]
 pub enum Encoding {
     /// The `chunked` encoding.
     Chunked,

src/header/shared/quality_item.rs

@@ -9,7 +9,7 @@ use std::str;
 
 /// Represents an item with a quality value as defined in
 /// [RFC7231](https://tools.ietf.org/html/rfc7231#section-5.3.1).
-#[deriving(Clone, PartialEq)]
+#[derive(Clone, PartialEq)]
 pub struct QualityItem<T> {
     /// The actual contents of the field.
     pub item: T,