adjust supporters section [skip ci]

Author: csabahruska

README.md

@@ -21,10 +21,10 @@ Also check the GRIN transformation [example from Boquist PhD](http://nbviewer.ju
 
 ## Support
 
-The project is supported by these awesome [backers](https://github.com/grin-compiler/grin/blob/master/BACKERS.md).
+The project is supported by these awesome [backers](https://github.com/grin-compiler/grin/blob/master/BACKERS.md). Special thanks to our gold sponsor:
+### *Sam Griffin*
+
 If you'd like to join them, please consider become a backer or sponsor on [Patreon](https://www.patreon.com/csaba_hruska).  
-Special thanks to our gold sponsor:
-*<h3>Sam Griffin</h3>*
 
 <a href="https://www.patreon.com/csaba_hruska">
 <img src="https://c5.patreon.com/external/logo/become_a_patron_button.png" width="150"/>