Dependency issues

mix.md

  defp deps do
    [{:phoenix, "~> 1.2.1"},
     {:phoenix_pubsub, "~> 1.0"},
     {:phoenix_ecto, "~> 3.0"},
     {:postgrex, ">= 0.0.0"},
     {:phoenix_html, "~> 2.6"},
     {:phoenix_live_reload, "~> 1.0", only: :dev},
     {:gettext, "~> 0.11"},
     {:cowboy, "~> 1.0"},
     {:exirc, "~> 1.0"},
     {:distillery, "~> 1.4"},
     {:oauth2, "~> 0.9"},
     {:httpoison, "~> 0.11.1"},
     {:scrivener_ecto, "~> 1.0"},
     {:timex, "~> 3.0"},
     {:arc, "~> 0.8.0"},
     {:arc_ecto, "~> 0.7.0"},
     {:timber, "~> 2.0"},
     {:ex_aws, "~> 1.1"},
     {:hackney, "~> 1.6.5"},
     {:poison, "~> 3.1"},
     {:sweet_xml, "~> 0.6"}]
  end