add : link to icon atrist added.

Author: sadrasabouri

README.md

@@ -90,6 +90,6 @@ The game continues until a faction achieves its win condition; for the Residents
 |     Resident    | <img width="100" height="100" src="https://raw.githubusercontent.com/sadrasabouri/mafia/master/static/images/roles/Resident_1.png"><img width="100" height="100" src="https://raw.githubusercontent.com/sadrasabouri/mafia/master/static/images/roles/Resident_2.png"><img width="100" height="100" src="https://raw.githubusercontent.com/sadrasabouri/mafia/master/static/images/roles/Resident_3.png"><img width="100" height="100" src="https://raw.githubusercontent.com/sadrasabouri/mafia/master/static/images/roles/Resident_4.png">                                                                                                                 |
 
 ## References
-Icons made by <a href="https://www.flaticon.com/authors/vectors-market" title="Vectors Market">Vectors Market</a> from <a href="https://www.flaticon.com/" title="Flaticon"> www.flaticon.com</a>
+Icons made by <a href="https://www.flaticon.com/authors/vectors-market" title="Vectors Market">Vectors Market</a> and <a href="https://www.flaticon.com/authors/pixel-perfect" title="Pixel perfect">Pixel perfect</a> from <a href="https://www.flaticon.com/" title="Flaticon"> www.flaticon.com</a>
 
 + [https://en.wikipedia.org/wiki/Mafia_(party_game)](https://en.wikipedia.org/wiki/Mafia_(party_game))