Update README.md

README.md

@@ -21,9 +21,9 @@ Grbl includes full acceleration management with look ahead. That means the contr
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 _Grbl is an open-source project and fueled by the free-time of our intrepid administrators and altruistic users. If you'd like to donate, all proceeds will be used to help keep this project sustainable and to fund supporting equipment. Thank you!_
 
-| _One-Time Donation_ | _Recurring Donations_ |
-|:--:|:--:|
-|[![Donate](https://www.paypalobjects.com/en_US/i/btn/btn_donate_LG.gif)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=EBQWAWQAAT878)| [![Support via Gratipay](https://cdn.rawgit.com/gratipay/gratipay-badge/2.1.3/dist/gratipay.png)](https://gratipay.com/chamnit/) |
+| [![Donate](https://www.paypalobjects.com/en_US/i/btn/btn_donate_LG.gif)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=EBQWAWQAAT878) | [![Flattr Grbl](http://api.flattr.com/button/flattr-badge-large.png)](https://flattr.com/submit/auto?user_id=chamnit&url=github.com/grbl/grbl&title=Grbl&language=&tags=github&category=software) | [![Support via Gratipay](https://cdn.rawgit.com/gratipay/gratipay-badge/2.1.3/dist/gratipay.png)](https://gratipay.com/chamnit/) |
+|:--:|:--:|:--:|
+
 
 ***