in the python 2 style on both python 2 and 3.
* The resolver will now do negative caching if a cache has been configured.
+
+* TSIG and OPT now have rdata types.
+
+* The class for query messages is now QueryMessage. Class Message is now a
+ base class, and is also used for messages for which we don't have a better
+ class. Update messages are now class UpdateMessage, though class Update
+ is retained for compatibility.
+
+* Support for Windows 95, 98, and ME has been removed.