Update README.md

Author: Abin-Packt

README.md

@@ -1,8 +1,8 @@
 # Mastering GUI Programming with Python
 
-<packt link><img src="" alt="Mastering GUI Programming with Python" height="256px" align="right"></a>
+<https://www.packtpub.com/application-development/mastering-gui-programming-python><img src="https://www.packtpub.com/application-development/mastering-gui-programming-python" alt="Mastering GUI Programming with Python" height="256px" align="right"></a>
 
-This is the code repository for [Mastering GUI Programming with Python](packt link), published by Packt.
+This is the code repository for [Mastering GUI Programming with Python](https://www.packtpub.com/application-development/mastering-gui-programming-python), published by Packt.
 
 **Develop impressive cross-platform GUI applications with PyQt**