Use System.get_env instead of application

lib/diskuy_web/auth/google_auth.ex

@@ -13,7 +13,7 @@ defmodule DiskuyWeb.Auth.GoogleAuth do
   end
 
   defp handle_get_proxy(url) do
-    case Application.get_env(:diskuy, :proxy) do
+    case System.get_env("PROXY") do
       nil ->
         HTTPoison.get(url)
       proxy ->