fixing the url

Author: bruAristimunha

examples/tutorials/tutorial_4_adding_a_dataset.py

@@ -138,7 +138,7 @@ def data_path(
         if subject not in self.subject_list:
             raise (ValueError("Invalid subject number"))
 
-        url = "{:s}subject_0{:d}.mat".format(ExampleDataset_URL, subject)
+        url = "{:s}/files/subject_0{:d}.mat".format(ExampleDataset_URL, subject)
         path = dl.data_dl(url, "ExampleDataset")
         return [path]  # it has to return a list