v4.0.0-rc.0

• ✨ added AsyncData (module)
• ✨ added AsyncDataResult (module)
• ✨ added AsyncOption (module)
• ✨ added AsyncResult (module)
• ✨ added A.sample (gets a random element from provided array)
• ✨ added O.all (transforms an array of Options into a single Option data type)
• ✨ added R.all (transforms an array of Results into a single Result data type)
• ✨ added R.filter (returns Ok(value) if the result is Ok and the result of predicateFn is truthy, otherwise, returns Error)
• 🐛 fixed up the groupBy signature (#48)