replace custom p2/3 code in config.py

Author: mfeurer

openml/config.py

@@ -3,7 +3,9 @@
 """
 import logging
 import os
-import sys
+
+from six import StringIO
+from six.moves import configparser
 
 
 logger = logging.getLogger(__name__)
@@ -16,12 +18,7 @@
 cachedir = ""
 
 
-if sys.version_info[0] < 3:
-    import ConfigParser as configparser
-    from StringIO import StringIO
-else:
-    import configparser
-    from io import StringIO
+
 
 
 def _setup():