remove Mix.Config usage

Author: ananthakumaran

config/config.exs

@@ -1,4 +1,4 @@
-use Mix.Config
+import Config
 
 config :logger, :console, format: "\n$date $time [$level]: $message \n"
 

config/dev.exs

@@ -1 +1 @@
-use Mix.Config
+import Config

config/test.exs

@@ -1,4 +1,4 @@
-use Mix.Config
+import Config
 
 config :logger, :console, format: "\n$date $time [$level]: $message \n"
 

mix.exs

@@ -34,6 +34,8 @@ defmodule Exq.Mixfile do
       {:redix, ">= 0.9.0"},
       {:poison, ">= 1.2.0 and < 6.0.0", optional: true},
       {:jason, "~> 1.0", optional: true},
+
+      # test
       {:excoveralls, "~> 0.18", only: :test},
       {:castore, "~> 1.0", only: :test},
       {:flaky_connection,