Remove duplicate StringIO import

jdufresne · jdufresne · commit 4efc82d568fe · 2018-01-04T18:05:08.000-08:00
diff --git a/sqlparse/compat.py b/sqlparse/compat.py
@@ -44,4 +44,3 @@ def unicode_compatible(cls):
     string_types = (str, unicode,)
     from StringIO import StringIO
     file_types = (file, StringIO, TextIOBase)
-    from StringIO import StringIO
