Alias for Elixir to run `mix dialyzer` and `mix test --stale`

mix.exs

defmodule KV.Mixfile do
  use Mix.Project

  def project do
    [app: :kv,
     version: "0.1.0",
     elixir: "~> 1.3",
     build_embedded: Mix.env == :prod,
     start_permanent: Mix.env == :prod,
     aliases: aliases,
     deps: deps()]
  end

  defp aliases do
    [t: ["credo --strict", "dialyzer", &run_tests/1]]
  end

  defp run_tests(_) do
    Mix.env(:test)
    Mix.Tasks.Test.run(["--stale"])
  end

  def application do
    [applications: [:logger]]
  end

  defp deps do
    [
      {:dialyxir, "~> 0.3.5", only: [:dev]},
      {:credo, "~> 0.4", only: [:dev, :test]}
    ]
  end
end