Implement __ne__ when __eq__ is defined
diff --git a/Lib/fontTools/misc/py23.py b/Lib/fontTools/misc/py23.py
index ff33980..0e5e45f 100644
--- a/Lib/fontTools/misc/py23.py
+++ b/Lib/fontTools/misc/py23.py
@@ -57,6 +57,8 @@
 
 		def __new__(self, content):
 			return str.__new__(self, self.transcode(content))
+		def __ne__(self, other):
+			return not self.__eq__(other)
 		def __eq__(self, other):
 			return str.__eq__(self, self.transcode(other))