Update the donation options

README.md

@@ -1,5 +1,4 @@
 [![License GPL 3][badge-license]](http://www.gnu.org/licenses/gpl-3.0.txt)
-[![Gratipay](http://img.shields.io/gratipay/bbatsov.svg)](https://gratipay.com/bbatsov/)
 
 Emacs Prelude
 =============
@@ -17,6 +16,12 @@ Prelude is compatible **ONLY with GNU Emacs 24.4+**. In general you're
 advised to always run Prelude with the latest Emacs - currently
 **24.5**.
 
+You can support the development of Prelude via
+[Salt](https://salt.bountysource.com/teams/prelude) and
+[Gratipay](https://www.gratipay.com/prelude).
+
+[![Support via Gratipay](https://cdn.rawgit.com/gratipay/gratipay-badge/2.1.3/dist/gratipay.png)](https://gratipay.com/prelude)
+
 **Table of Contents**
 
 - [Fast Forward](#fast-forward)
@@ -689,10 +694,6 @@ development of Emacs Prelude.
 Bug reports and suggestions for improvements are always
 welcome. GitHub pull requests are even better! :-)
 
-I'm also accepting financial contributions via [gittip](https://www.gittip.com/bbatsov).
-
-[![Support via Gittip](https://rawgithub.com/twolfson/gittip-badge/0.2.0/dist/gittip.png)](https://www.gittip.com/bbatsov)
-
 Cheers,<br/>
 [Bozhidar](https://twitter.com/bbatsov)