adding :ets to keep track of current value

lib/clip/application.ex

@@ -14,9 +14,10 @@ defmodule Clip.Application do
       # Start the PubSub system
       {Phoenix.PubSub, name: Clip.PubSub},
       # Start the Endpoint (http/https)
-      ClipWeb.Endpoint
+      ClipWeb.Endpoint,
       # Start a worker by calling: Clip.Worker.start_link(arg)
       # {Clip.Worker, arg}
+      Clip.Currents
     ]
 
     # See https://hexdocs.pm/elixir/Supervisor.html