Update __init__.py

Fix no module exception in python3.7

Author: hadifar

randomAccessReader/__init__.py

@@ -10,9 +10,12 @@
 # =============
 
 import csv
-from io import StringIO
 import six
 
+try:
+    from StringIO import StringIO
+except ImportError:
+    from io import StringIO
 # ==========
 # classes
 # ==========