Updating flattr image

README.md

@@ -29,7 +29,7 @@ up and about. A version which will gzip text/html after res.render() / res.end()
 
 [node-compress](https://github.com/waveto/node-compress) gzip library is used for gzipping.
 
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+Found gzippo helpful? Why don't you [tip us](http://tiptheweb.org/tip/?link=https%3A%2F%2Fgithub.com%2Ftomgallacher%2Fgzippo&title=Tip%20to%20Support%20gzippo) [![Flattr Button](http://api.flattr.com/button/flattr-badge-large.png "Flattr This!")](https://flattr.com/thing/282348/gzippo-node-js-gzip-module "gzippo - node.js gzip module")
 Bitcoin me: 1DnVpXSGubdyBSbyuJZNMNzkAVrwPJhaUL
 
 ## License