add TODO item

Author: valeriupredoi

tests/test_real_s3.py

@@ -61,6 +61,7 @@ def test_s3_small_file():
     assert result == 222.09129333496094
 
 
+# TODO un-xfail immediately after Pyfive released with PR #197
 @pytest.mark.xfail(reason="Pyfive needs PR #197")
 def test_s3_small_dataset():
     """Run an S3 test on a small file."""