Add Try and Task

New Try monad

=> #47

New Task monad

=> #45

Improve List monad

Initialize list with [](*args)
=> #34

Add List#reverse
=> #41

Add Comparable
=> https://github.com/alex-lairan/monads/pull/35/files

Add List#next and Indexable
=> #36
=> #42

Add #sort and #sort_by
=> #43
=> #44

Add #permutations, #subsequences and #join
=> #40

Add #last and #empty
=> #39

Add #to_s and #inspect
=> #38

Misc

Add #| (bind) and #>> (sequence) operator
=> #46

Update readme
=> #48
=> #50 Thanks @amelie-certin