docs(readme): update with await

README.md

@@ -2,27 +2,19 @@
 
 [![Node.js CI](https://github.com/mborne/node-dl/actions/workflows/node.js.yml/badge.svg)](https://github.com/mborne/node-dl/actions/workflows/node.js.yml) [![Coverage Status](https://coveralls.io/repos/github/mborne/node-dl/badge.svg?branch=master)](https://coveralls.io/github/mborne/node-dl?branch=master)
 
-## Description
-
-Download file from a given `sourceUrl` to a `targetPath`.
-
-Note that :
-
-* It relies on `wget` to simplify FTP downloads
-* A temp file `{targetPath}.part` is created while downloading to handle download interuptions
+Download file from a given `sourceUrl` to a `targetPath` with `wget`.
 
 ## Usage
 
 ```js
 const download = require('@mborne/dl');
 
-download({
+/*
+ * Note that a temp file `{targetPath}.part` is created while downloading to handle download interuptions
+ */
+const targetPath = await download({
     sourceUrl: 'https://github.com/mborne.keys',
     targetPath: '/tmp/mborne.keys'
-}).then(function(targetPath){
-    console.log(targetPath);
-}).catch(function(err){
-    console.log(err.message);
 });
 ```