v0.7.0

Changed

• CronexScheduler.StopAsync takes a CancellationToken (StopAsync(CancellationToken cancellationToken = default)).
  It bounds the wait for handlers already dispatched, as a host's shutdown timeout does: when the token is cancelled
  first, StopAsync throws OperationCanceledException and a handler that ignores its own token keeps running.
  Without a token the behaviour is unchanged. Breaking for binaries compiled against 0.6.x (the method signature
  changed); source that calls StopAsync() compiles unchanged.
• The packages now carry the LICENSE text, so an application that redistributes them can ship the MIT notice
  from the package itself.