I know I made a promise to have the 0.5.x branch last more than 2 releases, but we added more breaking changes again, and 0.5.0 hasn't even been released yet
In any case, for those plugin developers who are interested:
Notification pushed action hook (action:notification.pushed) incoming data has changed:
From: An object containing the notification data
To: This object -- {notification: notification, uids: uids});
As always, this list will be updated as new breaking changes are added. In the case of this list -- don't commit and publish your change to npm yet, as 0.6.0 has not launched. We recommend you maintain these changes in a separate branch until then.