Submission Transitioned Activity

{
  "key":"submission.transitioned",
  "created_at":"2017-08-25T16:11:40.203Z",
  "data":{
    "initial_substate":"nue",
    "current_substate":"triaged"
  },
  "uuid":"47a25dc7-e838-4de5-b49b-0d5d41510311"
}

Attribute	Type or Potential Values	Note
`key`	`submission.transitioned`
`created_at`	DateTime
`data`	Hash	`submission.transitioned` activities will have two keys, `initial_substate` and `current_substate` which will match a Submission#substate. The timing initial/current refer to at the timing of the activity.
`uuid`	UUID