forward-sdk 0.1.26

Removed

• snapshots.cancel_jobs() and JobCancellation, added in 0.1.25. Forward has no
  snapshot-level job cancel: its only route is the administrator's DELETE /jobs/{cancelJobId}
  for one job or group of jobs. The helper was a client-side composite over the active-jobs
  list, cancelling other people's work on a guess about which rows belonged to a snapshot.
  Cancel a job with the raw cancel_job call, using a row's cancelLink from the active jobs.