py23 Use bytechr() instead of chr()
diff --git a/Lib/fontTools/misc/xmlWriter.py b/Lib/fontTools/misc/xmlWriter.py
index f59e74c..4f26228 100644
--- a/Lib/fontTools/misc/xmlWriter.py
+++ b/Lib/fontTools/misc/xmlWriter.py
@@ -159,7 +159,7 @@
 		elif n == lt:
 			return "<"
 		elif 32 <= n <= 127:
-			return chr(n)
+			return bytechr(n)
 		else:
 			return "&#" + repr(n) + ";"
 	return "".join(map(escapenum, a))