Disable Travis build cache (#259)

As Cargo doesn't remove old build artifacts, a build cache means a lot
of time is spent downloading constantly increasing in size build
artifacts, especially for nightly releases.

.travis.yml

@@ -27,12 +27,6 @@ matrix:
 sudo: false
 dist: trusty
 
-cache:
-  apt: true
-  directories:
-    - target/debug/deps
-    - target/debug/build
-
 script:
   - cargo build $FEATURES
   - cargo test -v $FEATURES

src/lib.rs

@@ -33,7 +33,7 @@
 //! # use reqwest::{Error, Response};
 //!
 //! # fn run() -> Result<(), Error> {
-//! let text = reqwest::get("https://www.rust-lang.org")?
+//! let body = reqwest::get("https://www.rust-lang.org")?
 //!     .text()?;
 //!
 //! println!("body = {:?}", body);