touch up Client doc example

src/client.rs

@@ -31,20 +31,16 @@ static DEFAULT_USER_AGENT: &'static str = concat!(env!("CARGO_PKG_NAME"), "/", e
 ///
 /// # Examples
 ///
-/// ```no_run
+/// ```
-/// # extern crate reqwest;
-/// #
 /// # use reqwest::{Error, Client};
 /// #
 /// # fn run() -> Result<(), Error> {
-///     let client = Client::new()?;
+/// let client = Client::new()?;
-///     client.get("http://httpbin.org/").send()?;
+/// let resp = client.get("http://httpbin.org/").send()?;
+/// #   drop(resp);
 /// #   Ok(())
 /// # }
 ///
-/// # fn main() {
-/// #   run().unwrap();
-/// # }
 /// ```
 #[derive(Clone)]
 pub struct Client {