Update donate.md

[skip ci]

donate.md

@@ -5,14 +5,15 @@ If you like this project and it's goals consider supporting it by making a donat
 
 [![Donate][2]][1]
 
-[![Gratipay](https://cdn.rawgit.com/gratipay/gratipay-badge/2.3.0/dist/gratipay.png)](https://www.gratipay.com/Hunter/)
+[![Gratipay](https://img.shields.io/gratipay/Hunter.svg?style=social&label=donate)](https://www.gratipay.com/Hunter/)
 
 Sberbank of Russia:
 * 5469 3800 3946 0992 (USD)
 * 5469 3800 2768 7895 (RUB)
 
+Also https://www.bountysource.com/ can be used to open a bounty for the exact problem. For such issues badge [bounty](https://github.com/ruslo/hunter/issues?q=is%3Aopen+is%3Aissue+label%3Abounty) will be added automatically.
+
 Thanks! :)
 
 [1]: https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=UN8PDZZ3Q7VVL
 [2]: https://www.paypalobjects.com/en_US/i/btn/btn_donate_SM.gif
-[todo]: http://img.shields.io/gratipay/Hunter.png