Address Elixir 1.16 compilation warnings (#139)

Author: bradhanks

config/config.exs

@@ -1,6 +1,6 @@
 # This file is responsible for configuring your application
 # and its dependencies with the aid of the Mix.Config module.
-use Mix.Config
+import Config
 
 config :bypass, test_framework: :ex_unit
 

lib/bypass/utils.ex

@@ -3,16 +3,14 @@ defmodule Bypass.Utils do
 
   Application.load(:bypass)
 
-  if Application.get_env(:bypass, :enable_debug_log, false) do
-    defmacro debug_log(msg) do
-      quote bind_quoted: [msg: msg] do
+  defmacro debug_log(msg) do
+    quote bind_quoted: [msg: msg] do
+      if Application.get_env(:bypass, :enable_debug_log, false) do
         require Logger
         Logger.debug(["[bypass] ", msg])
+      else
+        :ok
       end
     end
-  else
-    defmacro debug_log(_msg) do
-      :ok
-    end
   end
 end

test/bypass_test.exs

@@ -541,7 +541,7 @@ defmodule BypassTest do
   end
 
   test "Bypass.verify_expectations! - with ESpec it will check if the expectations are being met" do
-    Mix.Config.persist(bypass: [test_framework: :espec])
+    Application.put_all_env(bypass: [test_framework: :espec])
 
     # Fail: no requests
     bypass = prepare_stubs()
@@ -579,7 +579,7 @@ defmodule BypassTest do
       Bypass.verify_expectations!(bypass)
     end
 
-    Mix.Config.persist(bypass: [test_framework: :ex_unit])
+    Application.put_all_env(bypass: [test_framework: :ex_unit])
   end
 
   test "Bypass.open/1 raises when cannot start child" do