fix #8

Author: chuongmep

README.md

@@ -157,7 +157,7 @@ Thanks for providing a free All product IDE for this project.
 ## Credits
 
   * Daren Thomas (original RPS Developer) [RPS](https://github.com/architecture-building-systems/revitpythonshell)
-  * Joe Moorhouse (interactive shell was taken from his project [IronLab](http://ironlab.net/))
+  * Joe Moorhouse (interactive shell was taken from his project [IronLab](https://code.google.com/archive/p/ironlab/)
   * [Dimitar Venkov](https://github.com/dimven/NavisPythonShell) (original port to Navisworks)
   * [ChuongMep](https://github.com/chuongmep) (original port to Autocad)
   * The rest of the RPS contributors