docs: add usage info to readme

README.md

@@ -6,8 +6,11 @@ Github info in your [bitbar](https://getbitbar.com/).
 
 # Usage
 
+Add the following to your bitbar plugins path:
+
 ```
-const info = require('github-info');
+#!/usr/bin/env node
+const info = require('path/to/github-info');
 
 info({
 	username: 'w33ble',