Let count_next count logs per level instead of total

Author: mnishiguchi

lib/ring_logger/client.ex

@@ -235,11 +235,12 @@ defmodule RingLogger.Client do
   end
 
   def handle_call(:count_next, _from, state) do
-    count =
+    counts =
       Server.get(state.index, 0)
-      |> Enum.count(&should_print?(&1, state))
+      |> Enum.filter(&should_print?(&1, state))
+      |> Enum.frequencies_by(&elem(&1, 0))
 
-    {:reply, count, state}
+    {:reply, counts, state}
   end
 
   def handle_call({:tail, n}, _from, state) do