Fix broken documentation link.

README.rst

@@ -78,7 +78,7 @@ Next steps and Full Documentation
 ---------------------------------
 
 If you would like to create more complex levels (or entire Games with many Screens and Levels), read the
-`spygame documentation <https://sven1977.github.io/spygame/>`_, in which we'll create a full-blown 2D platformer Level
+`spygame documentation <https://ducandu.github.io/spygame/>`_, in which we'll create a full-blown 2D platformer Level
 (sorry about spygame's documentation still being work in progress).