fix feature definition typo

CXR_Reports.py

@@ -21,10 +21,10 @@ class ReportsCXR(datasets.GeneratorBasedBuilder):
   def _info(self):
     return datasets.DatasetInfo(
         description = _DESCRIPTION,
-        features = datasets.Features(
+        features = datasets.Features({
             'image': datasets.Image(),
             'report': datasets.Value(dtype='string')
-        )
+        })
     )
   def _get_drive_url(self, url):
         base_url = 'https://drive.google.com/uc?id='