Add missing release notes

Author: llucax

relnotes/setup-pat.bug.md

@@ -0,0 +1,16 @@
+### The `setup` comman will not attempt to login using user/password
+
+GitHub stopped supporting login using user/password with the API, so trying to
+do so in the `setup` command is doomed to fail. Because of this, support for
+generating a Personal Access Token (PAT) for the user is now removed. Instead
+the user has to create their own PAT manually and passing it to the `setup`
+command instead.
+
+In particular the `setup` command removed the `--password` option and added
+a `--oauthtoken` option instead, and when not specified, it will ask the user
+to create one (with some hints on how to do so).
+
+**NOTE:** This would normally be a breaking change deserving a new major, but
+since the tool was *externally* broken, there is no way to fix it without
+breaking changes and previous versions will be **all broken**, so it doesn't
+make sense to make a major release for this change.