Pass props to promiseFn

• Pass all props on <Async> as object argument to promiseFn

Custom instances

• Allow creating custom instances of Async

Add React as peer dependency

• Adds react as peer dependency

Initial release

• Choose between Render Props and Context-based helper components
• Provides convenient isLoading, startedAt and finishedAt metadata
• Provides cancel and reload actions
• Automatic re-run using watch prop
• Accepts onResolved and onRejected callbacks
• Supports optimistic updates using setData