Update Readme link in Readme

README.md

@@ -18,7 +18,7 @@ Getting started
 
 Start with having a look at the **[Documentation]** and the **[Javadoc]**.
 
-Instructions how to use Smack in your Java or Android project are provided in the [Smack 4.2 Readme and Upgrade Guide](https://github.com/igniterealtime/Smack/wiki/Smack-4.2-Readme-and-Upgrade-Guide).
+Instructions how to use Smack in your Java or Android project are provided in the [Smack Readme and Upgrade Guide](https://igniterealtime.org/projects/smack/readme).
 
 Professional Services
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