added popdyn in example output

README

@@ -5,7 +5,7 @@ to organize iterated prisoner's dilemma competition between different
 strategies.
 
 It has been written for the "[Mathematics and Biology Workgroup](http://www.gt-mathsbio.biologie.ens.fr/)" in the
-École normale supérieure (Paris, France) and it gives [this kind of output](http://www.eleves.ens.fr/home/doulcier/projects/math/ipdt.html).
+École normale supérieure (Paris, France) and it gives [this kind](http://www.eleves.ens.fr/home/doulcier/projects/math/ipdt.html) [of output](http://www.eleves.ens.fr/home/doulcier/projects/math/popdyn.html ).
 
 ## How to 
 ### Play around