v0.4.0

Added

• Calling #dispatch on tasks now allows to process tasks asynchronously

Changes

• Update Zenaton engine URL to point to the new subdomain.

Fixed

• When creating a Wait task which uses both #at (to specify time) and either
  #day_of_month or #monday et al (to set day), it was surprising that the
  wait task only waited for next week/month when it would make sense to wait for
  later the same day. For example, on a Monday at 1 p.m, it waits for a couple
  of hours if you create a wait task with .monday(1).at("15"). Otherwise the
  previous behaviour of waiting for next week is preserved.
• Fix encoding of query parameters when searching for existing workflows