Signed-off-by: Denis Kirillov <denis@nspcc.ru>
NewOption
In all other places we use `Option` as `func`, there is no need in additional indirection. Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
Also, remove deprecated methods and types. Close #60. Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>