Added gratipay widget

Author: oscarotero

README.md

@@ -3,6 +3,8 @@
 [![Build Status](https://travis-ci.org/oscarotero/Embed.svg?branch=master)](https://travis-ci.org/oscarotero/Embed)
 [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/oscarotero/Embed/badges/quality-score.png?s=79e37032db280b9795388124c030dcf4309343d1)](https://scrutinizer-ci.com/g/oscarotero/Embed/)
 
+[![Support via Gittip](https://img.shields.io/gratipay/oscarotero.svg)](https://www.gratipay.com/oscarotero/)
+
 PHP library to get information from any web page (using oembed, opengraph, twitter-cards, scrapping the html, etc). It's compatible with any web service (youtube, vimeo, flickr, instagram, etc) and has adapters to some sites like (archive.org, github, facebook, etc).
 
 Requirements: