v0.13.0

• Moves on_cancellation logic from the before delayed job lifecycle hook to the after hook. (bf9bc686)
• Gem will now fail to load if Delayed::Worker.destroy_failed_jobs is set to true. (bf9bc686)
• Wrapped the job group cancel hook in a lock to prevent concurrently failing jobs from enqueueing multiple on cancellation jobs. (bf9bc686)