Merge pull request #12 from ryandbair/fix-example

Fix example

.gitignore

@@ -1 +1,3 @@
 build
+target
+Cargo.lock

src/lib.rs

@@ -17,7 +17,7 @@
 //! fn main() {
 //!   match syslog::unix(Facility::LOG_USER) {
 //!     Err(e)         => println!("impossible to connect to syslog: {:?}", e),
-//!     Ok(mut writer) => {
+//!     Ok(writer) => {
 //!       let r = writer.send(Severity::LOG_ALERT, "hello world");
 //!       if r.is_err() {
 //!         println!("error sending the log {}", r.err().expect("got error"));