imported StringIO from six instead of io

chrispycheng · chrispycheng · commit 59006b049d5e · 2018-07-27T10:34:51.000-04:00
diff --git a/nibabel/cmdline/tests/test_utils.py b/nibabel/cmdline/tests/test_utils.py
@@ -15,7 +15,7 @@
 from os.path import (join as pjoin)
 from nibabel.testing import data_path
 from collections import OrderedDict
-from io import StringIO
+from six import StringIO
 
 
 def test_table2string():
