Emit notice logs in :console backend

yes.. this is not very "backward compatible"..
I guess adding some config flag to enable it, and
default it to false.. would be proper (?)

Author: riccardomanfrin

lib/logger/lib/logger.ex

@@ -835,7 +835,7 @@ defmodule Logger do
     alert: :error,
     critical: :error,
     warning: :warn,
-    notice: :info
+    notice: :notice
   }
 
   for level <- @levels do

lib/logger/lib/logger/backends/console.ex

@@ -236,6 +236,7 @@ defmodule Logger.Backends.Console do
       info: Keyword.get(colors, :info, :normal),
       warn: Keyword.get(colors, :warn, :yellow),
       error: Keyword.get(colors, :error, :red),
+      notice: Keyword.get(colors, :notice, :blue),
       enabled: Keyword.get(colors, :enabled, IO.ANSI.enabled?())
     }
   end

lib/logger/lib/logger/handler.ex

@@ -12,7 +12,7 @@ defmodule Logger.Handler do
   defp erlang_level_to_elixir_level(:critical), do: :error
   defp erlang_level_to_elixir_level(:error), do: :error
   defp erlang_level_to_elixir_level(:warning), do: :warn
-  defp erlang_level_to_elixir_level(:notice), do: :info
+  defp erlang_level_to_elixir_level(:notice), do: :notice
   defp erlang_level_to_elixir_level(:info), do: :info
   defp erlang_level_to_elixir_level(:debug), do: :debug
   defp erlang_level_to_elixir_level(:all), do: :debug