update : README.md updated.

Author: sadrasabouri

README.md

@@ -1,12 +1,12 @@
 # mafia
 :dollar: Web Server Application For Mafia Game Playing On Local Network
 
-# Roles
+## Roles
 | Role            | image(s)                                                                                                                                |
 | :-------------: |:----------------------------------------------------------------------------------------------------------------------------:           |
 |      Don        | <img width="100" height="100" src="https://raw.githubusercontent.com/sadrasabouri/mafia/master/static/images/roles/Don.png">            |
 |     Doctor      | <img width="100" height="100" src="https://raw.githubusercontent.com/sadrasabouri/mafia/master/static/images/roles/Doctor_1.png"><img width="100" height="100" src="https://raw.githubusercontent.com/sadrasabouri/mafia/master/static/images/roles/Doctor_2.png">       |
 |     Resident    | <img width="100" height="100" src="https://raw.githubusercontent.com/sadrasabouri/mafia/master/static/images/roles/Resident_1.png">     |
 
-# References
+### 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>