(Mix) Could not start application ranch: could not find application file: ranch.app

Questions & Help Questions
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2

You should add cowboy too, and maybe jason, if You want… (It is an optional dependency of maru)

    [
      {:cowboy, "~> 2.1"},
      {:maru, "~> 0.13.1"},
    ]

Then

$ mix deps.get
$ iex -S mix
Erlang/OTP 20 [erts-9.1] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:10] [hipe] [kernel-poll:false]

===> Compiling ranch
===> Compiling cowlib
===> Compiling cowboy
==> plug
Compiling 48 files (.ex)
Generated plug app
==> maru
Compiling 56 files (.ex)
warning: function Jason.decode!/1 is undefined (module Jason is not available)
  lib/maru/test.ex:99

Generated maru app
==> elixirrest
Compiling 1 file (.ex)
Generated elixirrest app
Interactive Elixir (1.6.1) - press Ctrl+C to exit (type h() ENTER for help)
iex(1)>

BTW the latest maru is 0.13.1, and optional jason is version 1.0