Version 2.4.0

This is the first release under the @Prev dist tag on npm

breaking

• removes the feature of resolving custom actions in favour of resolving thunks for providing the same functionality.
• returns original promise from dispatch instead of a custom action

notes
if your original promise rejects, you can optionally catch it yourself from the caller of the action creator -- also if your promises have extra functionality (such as try or finally), this will be available from the caller.