refactor(lib): update to 2018 edition

src/lib.rs

@@ -53,10 +53,10 @@ pub use http::{
     Version,
 };
 
-pub use client::Client;
-pub use error::{Result, Error};
-pub use body::{Body, Chunk};
-pub use server::Server;
+pub use crate::client::Client;
+pub use crate::error::{Result, Error};
+pub use crate::body::{Body, Chunk};
+pub use crate::server::Server;
 
 #[macro_use]
 mod common;