<-/2 has been deprecated in favor of send/2
Enumerable.member? should return { :ok, boolean }
Upgrade to Elixir ~>0.12.2
fix continuation in new enumerable protocol
added methods all/0, up/0, add_node/1, del_node/1.
made update_ring/2 private
Merge pull request #2 from eraserewind/module-sugar-methods

Module sugar methods