Update diagram link

Author: polats

README.md

@@ -44,7 +44,7 @@ To deploy on IPFS we need to do the following steps:
 
 ## Game3.js Overview
 
-![Game3.js Overview](http://www.plantuml.com/plantuml/proxy?src=https://raw.github.com/alto-io/game3.js/main/plantuml/overview.txt)
+![Game3.js Overview](http://www.plantuml.com/plantuml/proxy?src=https://raw.githubusercontent.com/alto-io/game3.js/main/plantuml/overview.txt)
 
 ## Licenses