Update README.md

update link

Author: jojozhuang

README.md

@@ -44,4 +44,4 @@ git clone https://github.com/jojozhuang/game-store-aspnet.git
 On Windows, open the project in Visual Studio, compile and run. Access http://localhost:5000/ in web browser, enjoy!
 
 # Portfolio
-Read portfolio [Online Game Store(ASP.NET)](https://jojozhuang.github.io/portfolio/game-store-aspnet/) to learn the main functions of this online store application.
+Read portfolio [Online Game Store(ASP.NET)](https://jojozhuang.github.io/project/game-store-aspnet) to learn the main functions of this online store application.