Remove Python 2.x imports

CHANGELOG.md

@@ -2,6 +2,7 @@ Changelog
 ---------
 
 Unreleased
+- remove Python 2.x imports
 
 1.2.1
 - (SECURITY) Use [defusedxml](https://github.com/tiran/defusedxml) to prevent XML SAX vulnerabilities ([#94](https://github.com/stchris/untangle/pull/94))

untangle.py

@@ -19,20 +19,11 @@
 from xml.sax import handler
 
 
-try:
-    from StringIO import StringIO
-except ImportError:
-    from io import StringIO
-try:
-    from types import StringTypes
+from io import StringIO
 
-    def is_string(x):
-        return isinstance(x, StringTypes)
 
-except ImportError:
-
-    def is_string(x):
-        return isinstance(x, str)
+def is_string(x):
+    return isinstance(x, str)
 
 
 __version__ = "1.2.1"