updated link

Part 1.1 - Introduction.md

@@ -374,6 +374,6 @@ Next let's discuss briefly about exeptions and error handling. Sometimes a proce
 It's also good to recognize when an procedures only observes data and when it might modify it. Similarly, for example, printing to a screen and printer changes the physical world irreversibly, even if the computation would be reversed.
 
 
-Part 2 materials and exercises will be published on **May 8th**.
+Now do the exercises for part 1 in ViLLE, and then continue to ![Part 2.1 - Contract-Based Programming](Part%202.1%20-%20Contract-Based%20Programming.md).