Updated donation section

README.md

@@ -93,7 +93,12 @@ You can add your own algorithm via `layout.addAlgorithm`
 In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint via `npm run lint` and test via `npm test`.
 
 ## Donating
-Support this project and [others by twolfson][gittip] via [gittip][].
+Support this project and [others by twolfson][gratipay] via [gratipay][].
+
+[![Support via Gratipay][gratipay-badge]][gratipay]
+
+[gratipay-badge]: https://cdn.rawgit.com/gratipay/gratipay-badge/2.x.x/dist/gratipay.png
+[gratipay]: https://www.gratipay.com/twolfson/
 
 [![Support via Gittip][gittip-badge]][gittip]