Adresses issue #263

Updated example

examples/introduction_flatland_2_1.py

@@ -58,7 +58,7 @@ schedule_generator = sparse_schedule_generator(speed_ration_map)
 # We can furthermore pass stochastic data to the RailEnv constructor which will allow for stochastic malfunctions
 # during an episode.
 
-stochastic_data = {'malfunction_rate': 5,  # Rate of malfunction occurence
+stochastic_data = {'malfunction_rate': 20,  # Rate of malfunction occurence
                    'min_duration': 3,  # Minimal duration of malfunction
                    'max_duration': 20  # Max duration of malfunction
                    }