update timex and timex_ecto dependency versions. closes smpallen99#333

mix.exs

@@ -41,8 +41,8 @@ defmodule Coherence.Mixfile do
       {:gettext, "~> 0.14"},
       {:elixir_uuid, "~> 1.2"},
       {:phoenix_swoosh, "~> 0.2"},
-      {:timex, "~> 3.1"},
-      {:timex_ecto, "~> 3.2"},
+      {:timex, "~> 3.3"},
+      {:timex_ecto, "~> 3.3"},
       {:floki, "~> 0.19", only: :test},
       {:ex_doc, "~> 0.18", only: :dev},
       {:earmark, "~> 1.2", only: :dev, override: true},