py23 introduce byteord() and use it
diff --git a/Lib/fontTools/cffLib.py b/Lib/fontTools/cffLib.py
index f976e16..e5f9f73 100644
--- a/Lib/fontTools/cffLib.py
+++ b/Lib/fontTools/cffLib.py
@@ -608,7 +608,7 @@
 
 
 def readCard8(file):
-	return ord(file.read(1))
+	return byteord(file.read(1))
 
 def readCard16(file):
 	value, = struct.unpack(">H", file.read(2))