We've reorganised a lot of the rules and categories. Rule and category redirects should minimise any breakages, but you should update your config appropriately.
We have also changed the rules that are on by default. This may mean you now have to explicitly enable some rules you were previously checking, and you may find more warnings being raised.
external-functionhas been renamed to the more accurateprocedure-not-in-module. The rule code is stillM001.