update to es6 import/export

Author: davidchase

index.js

@@ -1,12 +1,12 @@
 'use strict';
 
-const {compose, toLower, replace, append, decode} = require('./prelude');
+import {compose, toLower, replace, append, decode} from './prelude';
 
 const dedupeSlashes = /([^:]\/)\/+/g;
 const dedupeDots = /\/\.+/g;
 const defaultPorts = /(\:80|\:443)/;
 
-exports.normalize = compose([
+export default compose([
     replace(dedupeSlashes, '$1'),
     replace(dedupeDots, '/'),
     replace(defaultPorts, ''),