Update README.md

Author: RezaGooner

README.md

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 # 2D RPG Game (SFML)
 
-This project is a **2D Role-Playing Game (RPG)** inspired by the nostalgic **Super Mario** style. It is developed in **C++** using the **SFML** library.
+This project is a **2D Role-Playing Game (RPG)** inspired by the nostalgic **Super Mario** style. It is developed in **C++** using the **SFML** library(v2.5.1)
 
 ## About the Game
 Get ready for an exciting adventure!