Update example from the dark ages

Author: sfackler

README.md

@@ -12,28 +12,27 @@ A crate providing access to the Postgres large object API.
 extern crate postgres;
 extern crate postgres_large_object;
 
-use std::old_path::Path;
-use std::old_io::fs::File;
-use std::old_io::util;
+use std::fs::File;
+use std::io;
 
 use postgres::{Connection, SslMode};
 use postgres_large_object::{LargeObjectExt, LargeObjectTransactionExt, Mode};
 
 fn main() {
     let conn = Connection::connect("postgres://postgres@localhost", &SslMode::None).unwrap();
 
-    let mut file = File::open(&Path::new("vacation_photos.tar.gz")).unwrap();
+    let mut file = File::open("vacation_photos.tar.gz").unwrap();
     let trans = conn.transaction().unwrap();
     let oid = trans.create_large_object().unwrap();
     {
         let mut large_object = trans.open_large_object(oid, Mode::Write).unwrap();
-        util::copy(&mut file, &mut large_object).unwrap();
+        io::copy(&mut file, &mut large_object).unwrap();
     }
     trans.commit().unwrap();
 
-    let mut file = File::create(&Path::new("vacation_photos_copy.tar.gz")).unwrap();
+    let mut file = File::create("vacation_photos_copy.tar.gz").unwrap();
     let trans = conn.transaction().unwrap();
     let mut large_object = trans.open_large_object(oid, Mode::Read).unwrap();
-    util::copy(&mut large_object, &mut file).unwrap();
+    io::copy(&mut large_object, &mut file).unwrap();
 }
 ```